Just because you cannot prove it does not mean something didnt happen.
(Thats a general observation not an opinion on this scenario)
Say I knew of a situation where Matt Ford paid a Poole rider on loan at Ipswich to finish last in races at Foxhall so Poole qualfied in a certain competition.
I may not be able prove it but that wouldnt mean it didnt happen (and Im not saying it did btw ☺)