No, because in any example where those assumptions were, if fact, false, they produce inconsistent results.
Only accurate assumptions produce the expected consistent results.
Indeed, it's multiple cross-checking and cross-referencing of results from different methods which provide some level of confidence that assumptions are confirmed.
And here is the ultimate confirmation of those scientific "assumptions": radiometric dating can predict which types of fossils will later be found in a particular geological strata, and/or the types of fossils found in a particular strata can predict the results of later radiometric dating.
So that's not "absurd assumption", but rather confirmed scientific theory.
Its only scholastic authority not sceintific method. Look again at the list of assumptions required for the radiometric dating theory. None of those is falsifiable but are taken as authority regardless.