If he indeed only accessed the toiled shut off valve, then that would not affect the dishwasher.
Even if dirt/sediment got into the line to the washer somehow, it should be able to be cleared at the inlet valve to the washer.
As to you needing to replace the washer, one would need to determine what the problem is first. It could be a very simple and cheap repair.
If he indeed only shut off the toilet valve, then yes, it would be a coincidence that the washer went out the same day.
If you are on city water, then it is possible that if there is construction nearby or anything that would introduce sediment into the line upline from you, that it could have contaminated the washer.
If your toilet was having problems with water flow as well (thus your reason for calling a plumber) then I would strongly suspect that this is the case.
It is possible that both issues were caused by sediment/dirt from your city water source.
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