It’s not about stocking so much as printing contracts. Most of the British press here terminated their printing contracts with local printers when they could due to Covid and the absence of an economically viable British expat/second home owner/tourist purchase market.
The Daily Mail ceased its Mallorcan publication a few days after last Christmas (2020) with a promotional campaign to move readers onto their Tablet edition which is the same as the printed version.
The remaining printed exceptions are the odd copy of the Daily Mirror and the continental edition of the FT (Monday to Saturday).
Perhaps some may return if, god willing, things return to a sustainable normal. The printed German press have stuck things through but both the expat and tourist German communities in and visiting the island are a lot bigger than the British expat and visiting tourist communities.