@lpapp I think you're right:
$ git -C qtbase tag --list *lgpl
v5.15.3-lts-lgpl
v5.15.4-lts-lgpl
v5.15.5-lts-lgpl
$ git -C pyside-setup tag --list *lgpl
I had noticed this a month or two ago, and have been meaning to report it.
pyside-setup should follow same approach that the other qt repos are using. I don't think it's intentional, but rather just an oversight.