The best you can get is stuff people have extensively peer reviewed.

So Feynman Lectures on Physics for example are hard to beat. Though you will want to check for the various errata, the fact it was taught by a world class expert and received a great deal of peer review after the fact is about as much as you can hope for on any subject.

Is the implication then a 100% correct explanation does not exist?

More that we can’t verify if an explanation is correct only note where it isn’t.

I suspect there’s multiple math textbooks which combined with their errata are error free, but I don’t know if that’s true.

Sorry but no. Our ‘models’ of the universe will never be 100% correct.

If you’d like a 100% ‘correct’ explanation of the maxwells ‘laws’ of electrodynamics I refer to a sibling comment regarding the Feynman lectures. lectures.