Ok, so even with those assumptions, AoE4 is still likely currently smaller for both 1v1 and TGs. The ladder information is on a 30 day delay before numbers drop off, and for the last 30 days, AoE2 has been growing while AoE4 has been declining.Taking the average for teamgames in AOE4 really doesn't make any sense, anyone that plays any of the 3 modes is a team game player. So every one of the 54k 3v3 players would be considered as ranked in the AOE2 TG ladder, for example.
So the number of team game players is between the maximum (54k) and the sum (147.3k), depending on how much overlap there is.
Taking a quick random sample of the players (10 latest of each of the three modes), on average, each team game player is ranked in 2.1 different modes. So, we have approximately 147.3k/2.1 = 70.14k team game players in ranked AOE4. That would also line up with what you'd expect from the 1v1 numbers.
There is really no argument left that AoE4 has a larger player base than AoE2. Now the question is how much smaller it gets before the decline stops.