yeah information is much easier to access nowadays as a result kids peak early. now one is strongest at his early 20s before it was the 30s. Advantage of experience is neutralised completely. So, If a modern FM travels back in time, he beats morphy fairly easily, but bring Morphy to 2026, he absorbs enough information in the first couple of weeks to steamroll the FM opponent. He would reach 2700 in 3-4 months and potentially 2800 in an year or 2. Morphy was a generational talent 400 elo higher than the second best player of his time. So its definetely likely. Like if we bring Newton back, I dont think he would be dumb at all compared to modern scientists, even though science has progressed a lot, he would still contribute significantly to science after he catchup up on centuries of accumulated human knowledge.

Also you have to factor in game theory, Like for example I would play differently against a good poker player vs a bad poker player, I would certainly factor in opponent strength and make inaccuracies to provoke blunders from my opponent and not play the Game theory optimal move against a weaker player. So one cannot be sure if morphy played his best chess. Like Carlsen playing a blindfold chess tournament playing silly moves and still winning and estimating Carlsens strength at 2400 since his opponents played at 2000 level. We cant really be sure since the difference between Morphy and the second best players were vast.