I share the sentiment with the surprise that he is not on board. There may be different reasons for that - once we know the list of testers, we may better understand the likely background.
If they only chose happy puppies as testers, then it would be because they did not want any more critical review at this stage, perhaps because they want to get the 8K out no matter what. Would not exactly be an encouraging sign, would it.
If they chose somebody like Ben however, it may be that they think that Sjef has developed a negative bias towards them (whether that is the case or not I cannot judge) and would want to avoid giving him the opportunity to hammer them.
And who-ever they appointed, if they messed it up, even the happy puppies will not pretend to be enthusiastic about it, so the major issue of their choice of testers arises in the scenario, where the 8K has some not so serious flaws: here the happy puppies would wave it through, while the Ben's & Sjef's would mercilessly flag all flaws. Then it would likely be a bit of a guessing game if we users, once we receive the 8K, will see our experience with the 8K be substantially impacted by such flaws or if they would be quite acceptable on the grand scheme of things. This will likely vary from individual to individual.
In short: only time will tell...