I was never a member of that club and so can't really say what specific abuses took place. You'd have to ask the specific athletes who have claimed they saw abuse happening (e.g. the people who spoke in the Globe article, or Cliff's instagram post where she says she's seen "immoral behavior," describes DST's "bullying" and "emotional abuse," and calls him "manipulative and cruel;" Reid Coolsaet responds by saying he's seen DST "negatively treat athletes"; there have been some comments on trackie to this effect, too, I believe).
Even if we don't know the specifics, however, I think any reasonable person can conclude that a club that leaves multiple numerous former athletes in a state of PTSD and contemplating suicide, as well as many others in need of "healing" from professional therapists, must have had some extremely serious abuse issues. This isn't even remotely normal for a track club. Serious stuff must have gone on, and with that many former athletes suffering so severely it's highly unlikely other club members weren't aware of these serious abuses.
My basic point is pretty simple. Every public statement I've seen by a Guelph person claiming they've witnessed abuse winds up dodging the obvious question their claim raises: if abuse was happening in plain sight, in front of athletes, why didn't anyone do anything about it? (Or: if you tried to do anything about it, why did nothing change?)
By not addressing the most obvious question raised by their claim, these people are trying to have it two ways. They're claiming they're victims of an abusive club culture (and to be sure, it sounds like some at Speed River definitely were), but they're not acknowledging that they were part of a community that allowed this abuse to persist for years (and, if not for the Globe article, would likely have continued for many more).
The tactics employed on that Facebook thread are more of the same. The club members frame themselves as "trauma victims" who are in "shock" from the news about DST. The effect of this language is to position DST as pure evil and every other member of the club as utterly irresponsible for the abuses that took place. And when someone (e.g. Steve Boyd) asks why DST's abuses went unchallenged, they dodge the question by saying they never knew about the Megan Brown incident and conveniently forgetting about the abuses they claim to have seen with their own two eyes.
Sorry, I may be repeating myself a bit here. I can't offer you details of the specific abuses; only the athletes can. But I can point out the athletes' failure to acknowledge the obvious question of communal responsibility that arises logically from their claims.