If the team launched the bots, it was to influence public perception. They got caught, not because it they wanted to and was inevitable, but because the media looked into it during a period of heightened scrutiny. Had the team not kept the story in the spotlight by expelling the media from the charter flights, perhaps they don't look into it. A sophisticated campaign isn't needed to affect public perception, and while more sophistication might lead to them not getting caught, I doubt they expected anybody to be looking into it as it was pretty small scale, but in the event they do get caught, they just use the defense you've brought up.
All that, to be fair, this is a franchise that has gone to the lowest bidder more than once, not just in player personnel, and cut costs at pretty much every level from front office to ushers, so hiring a budget firm to enact the bot campaign, or heck, doing it in house isn't as implausible as you suggest imo, even if they weren't playing 3d chess knowing that it would give them plausible deniability should they get caught.