As usual, you arrive at your conclusions by assuming what you’re trying to prove.
good day
I am not assuming that these DNA differences are what result in a different protein that is more heat resistant. That is known.
I am not assuming that bacteria have a mechanism to increase their mutation rate during stress. That is known.
I AM assuming that you do not have any explanation for any of the above and that is why you are attempting to get out of displaying the supposed brilliant explanatory powers of creationism. BECAUSE THERE IS NO BRILLIANT EXPLANATORY POWERS OF CREATIONISM!
You have no answer for why a bacteria under stress would have a mechanism for increasing its mutation rate.
If flies in the face of everything you think you know about mutations.
So you cannot deal with it!
Good day!