Multi-Attacking Spells [duplicate]

This question already has an answer here:

  • Can I use Extra attack to cast two spells 1 answer

So I am running a home-brew with one of my players in 5e DnD. The basic concept is that it is similar to the draconic bloodline type of the sorcerer only that it is a vampiric bloodline. As a result this character has Multi-attack. Is it reasonable to say this means that they would be able to cast more than one spell with this ability?