The regulation actually enforces that PD is implemented if high speed charging is available and that it can’t be limited in speed compared to any other charging protocol that’s also available on the device, irrespective of the charging device used.
We don’t need to guess if we can just read the regulation: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32022L2380&qid=1691523718368.