For me the concern is more related to his bringing his children out with McRobb. This is all conjecture since we don't know if it was McRobb, but if it was, this is the optics: woman gets arrested for driving his escalade drunk, claims she left her watch in his room, fuelling affair rumours. There's been no official statement about his separation with Renata, and even if there had been, it's only been a month since he "went away". So now it looks like he's exposing his two children to his drunk driving mistress. If it was McRobb and Renata seriously wasn't there, then yeah, it's disgusting and to me reiterates the whole not taking any of it seriously (because even though I don't know much about rehab and addiction, I do know that they advise you not to get into relationships, especially with people who have substance issues which McRobb obviously has). But even if they aren't having an affair, if he's introducing the woman who was just arrested driving his escalade drunk, whether or not they have an intimate relationship, it looks off.
If however he was there with Renata and a Greenestone councillor, then yeah, it's a complete non-story. We will probably not know which though and as the pp just pointed out, this thread is ripe with speculation, I don't see why this should be different.