The you should be able to tell us what about 5e D&d makes it immune to analysis...
Just pointing out the claim made was not about abpnalysis, just white room theorycrafting analysis.
It was made I believe to point out the value different between that and analysis based on resukts actual play at the table in actual games.
Let me point out one example...
It's not at all uncommon to see references made by these ehitecroom excel warriors that base some assumption on "the average of" or "the frequency of" distribution of scores in the Monster Manual, rating each appearance in a stat block os say an AC vslue or a threat to a save type or saving throw scores equally in its tallies.
That is easily (drudgery) to compile and turn into numbers and scores snd ratios that can then be used to assess this feature vs that feature DPR etc.
But, in actual fact, no actual games use the distribution in the MM to populate their adversaries, much less the ones in encounters that matter. Those are
chosen not just driven by page flip. It's the ones
chosen in game play that serve as the lens through which actual play results come into focus.
In game actual play results bring all sides into play- protagonist and challenge and choice - to be seen, considered and evaluated. White room excel solo matherizing is, well, like a one-man duck measuring contest...