I think the "different rule" that is referred to there is an
MPCC rule rather than a rule enforced for all of cycling. And as such it has no-one really enforcing it as we saw with
Lars Boom and Astana, when push came to shove Vino just ignored the rule (and Astana got booted out of the MPCC, without any dreadful consequences for them, in fact with almost no consequence at all).
[Edit. The Lars Boom case was about low cortisol levels - MPCC rule 5, not direct use of corticosteroids, rule 6, which in any case only refers to intra-articular injections. So if you want to be pedantic about it, my post above is waffly rubbish. Get over it pedants.]