Follow up on this question of mine.
I have received an e-mail from Ryanair informing me of the cancellation of the flight.
This e-mail, invites me to accept a 12-months valid voucher (which could be however converted to a full refund after those 12 months anyway), but is also reads the following:
If you do not wish to accept this voucher option and wish to move your flight or request a refund, please click here to contact us.
That link, however, only relates to the voucher, and not to the plain refund. (The Chat bot doesn't help, as it never answers.)