This is the first time I've seen this suggested? I don't recall Pantani getting a "massive" moto drafting advantage ? Just checked some video of the 1995 record, most of the time the moto was well ahead of him (below is a link).
And checking video of the 2022 stage there are motos in front of Pog
and Vingo as well. Anyway, Pantani's performances against riders like Indurain and Ullrich and all the other doped climbers of that era should confirm his greatness. With modern equipment and training methods who knows what time he might have set on the Alpe!
1995 TdF Stage 10 ESPN