I read the grandparent post as "People in Silicon Valley often have the unrealistic expectation that everything a previously-successful entrepreneur does will succeed. When their first try inevitably doesn't work, this poisons the well for subsequent refinement and iteration. As a result, previously-successful entrepreneurs are creating startup labs to set the expectation that everything coming out of it is an experiment and insulate themselves from the PR backlash of trying some dumb ideas to get to a good one."
Which is not at-odds with your comment, although as a previously-successful entrepreneur, perhaps you can speak to whether or not there really is that backlash and premature judgment that he posits.
(Personally, as someone without much of a brand name, I relish the freedom that gives me to try stupid stuff. There's no way I'd be brave enough to try my current startup attempt - which is really quite humble - if everyone expected me to invent the next big thing.)