There were also no claims about whatever definition of restrictive you were using. It was just a short statement that the Timescale license was designed to be less restrictive than the AGPL. You can't really be that surprised when somebody comes along and starts judging it by Open Source standards after that, can you?
Comparisons to Open Source and discussions of the pros and cons of both approaches are, of course, fair.
I think Timescale employees should remember to preface "This is our belief on the definition of restrictive" when describing the license as more open than open source licenses, given much of the community might disagree (sometimes vehemently) about that take.