The Mach 100 claim has to do with this calc that was done on OBD(look into spoilers for whirlwind maze feat), and that calc seems rather dubious.
@Dream: Not really the point. He actually said that said calc which is pretty much his only hope is bullshit and then he goes on to say that they still are mach 100+ because they dodged machine gun fire. After i pointed out said flaw he said what is now the first quote i posted and even before that he said what i posted in the second quote.
There's no rhyme or reason to it, he just wants to believe that those feats are MHS/mach 100+ no proof or logic behind it whatsoever.