Dead in the water MBP

Not likely. That is something a spy might like to do, so it has likely been sealed off.

T2 has ties to Apple-ID and serial number as well, so even if your desoldering and re-soldering were PERFECT, it is still not likely to work.

You should just restore the files onto another computer from your Trusted backup copy.

I was not meaning to say that YOU were a spy -- only that Apple's sense of Privacy -- that your electronic devices are constantly under attack -- seems very complete.

[in my opinion] anything that a spy might like to do to a Mac (without the password) including re-soldering the chips to another board, has likely been completely sealed off.