They are, indeed, on summer lease to MyTravel and their presence in Europe has nothing to do with cruises.
In fact, C-FTDF an ex-Airtours machine (c/n 437, ex G-EPFR), while C-GTDL is c/n 476, ex EI-TLF of TransAer and D-AUKT of Fly FTI – another Airtours “associate”.