FWIW, Luke was clearly trying to prod Linus into acknowledging the problem of the "trust me, bro" warranty on the WAN show instead of treating it like a joke. I think he was also making some expressions of dissatisfaction about how that cooler block review was handled, which is a major part of this.
Obviously, there's only so far he can push things on his employer's platform. Plus, the two of them have been friends for a long time. But I do wonder if he's going to break in the not so distant future.