Update: I checked the same thread in privacyguides
someone posted that they do have a gift card, this is an official reseller it seems and if still feels sketchy to you, @Tuta_Official can I guess confirm for us.
they support cash, monero (you said you wanted to avoid crypto though) and bank transfer, though if in bank transfer at that point perhaps give it directly to tuta. Other than that yeah!
The ordering is also anonymous it seems with them only asking you write the code generated, this is nice.
Update 2: They are Tuta Support | Tuta