is this hypothetical scenario that can allow a spellcaster to create a demilich familiar(in dnd 2014) accurate?

Quote from Davyd >>

Quote from dorpenguin >>

Additional note i found, there is an official post on the topic and the verdict from jeremy crawford is "it's intended for npcs but a dm can allow players can use them", RAI the answer is if your DM says so

 No, that's stating the truism that the DM can change their rules. The quote literally says RAI it's for NPCs, everything after the "but" is an exception to the intent.

 thank you for the clarification

Quote from dorpenguin >>

Quote from jl8e >>

(Also, warlocks 100% count as spellcasters.)

 fair, also i'd say the same about warlocks but it gets a bit iffy due to them having "pact magic" and not spellcasting

 AFAIK, the only definition of "spellcaster" in the 2014 rules is in the magic items section of the DMG:

If the prerequisite is to be a spellcaster, a creature qualifies if it can cast at least one spell using its traits or features, not using a magic item or the like.

Hear me out. What if, a lich replaced a level 1 spell slot with find familiar and made it a Demilich? That could be interesting…