With care I can colapse (my wife's) Dahon Mu P8 to 29.8x65.4x79.5cm.
Kudos to Dahon for an honest 30x66x79cm marketed minimum size for this model. The fold & resultant dimensions would seem to be like the other Mu models, the Ecos, the Speeds, the Vitesse and the several private label machines they build for other companies.
So there apparently are quite a number of commonly available, modest cost bikes which will fit into the allowable 30x70x90cm envelope. Conspiracy myth: busted.
Not so easy. It's not about the folded size they are talking but the wheel size. So conspiracy theory - is still on.