It is hard to tell exactly where the leak is coming from.
I do not think that it is leaking from under the bar.
The crud you see looks more like calcium deposits from a slow leak. The water evaporates and leaves the mineral deposits.
It is more likely that it is leaking from the pump seal and then rinning under the bar and collecting there.
You will not know for sure until you remove the bar and check under neath it.

[COLOR="Blue"]So, is that repairable?[/COLOR]
Yes it should be.

If you have the old style heater call Whirlpool and see if they will replace it or do something for you.

If it is just a small hole as shown in the recall.
Hopefully the bar will come off fairly easily.
Remove the metal bar and clean off the mineral deposits.
You will probably be able to scrape them off, try not to scratch the tub especially where the hole is. If they are stubborn , wet a folded over piece of paper towel with vinegar and then place this on the deposits and leave it for 15 minutes or so. This should dissolve/loosen the deposits.
Then get a small screw and screw it into the hole not quite all the way down.
You may have to drill the hole out slightly, just make sure that the threads grip OK.
Also use a stainless screw. Regular screws will corrode quickly due to the corrosive action of the soap.
Remove the screw and if it has created a ridge around the hole inside the tub cut or carefully sand this off.
Then put some silicone/sealant over the hole and screw the screw all the way down. Do not over tighten it as you do not want to strip out your screw hole.
I would use high temp silicone that they use for car engine gaskets etc. This should be able to resist the heat and the corrosive dishwasher soap.
It would also be a good idea to put some sealant onto the underside of the screw so it seals on both sides of the tub. This should also prevent the screw from backing out.
If the screw is too long. Thread it in to get the tub plastic threaded and then when you remove it cut some of it's end off with a dremel.

If you have the room underneath for the nut, a bolt & nut will also do the job and will give a better seal on the underside of the tub.Use a dab of sealant on both sides of the tub.

Leave the kick plate off for a week or so, so you can be sure that your fix worked.
Place a paper towel under the leaking area as a drip will show up better.
Tape it to the floor if you have to (if the motor fan blows it around).
Also check that the screw head inside the tub is not heating up and melting the tub.

FYI: It is a good idea to place a drip mat under the unit. These are available commercially. What it does is protect your floor. If you cannot find one get a baking pan or a plastic boot mat/tray that is large enough to cover the areas under the tub that may leak. I cut a inch or two section of the side wall out at the front (kick plate side) of the tray/pan. Then if you do get a leak water will show up in front of the dishwasher and you know that you have a problem. Often it will not cover the area under the water valve so I make one for that area out of tin foil.
This can help prevent a rotten floor under you dishwasher.

I started to give an answer and ended up writing a novel but I hope I did not confuse you or put you to sleep.
Hope it helps!!

You have to check the water inlet valve which feeds the water from the home’s main water line into the dishwasher and could be the source of a leak.

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