I kinda think it fits because I always thought the lunatic cultist as a lihzahryd because:
1 the lihzahards were abandoned by their deity (moonlord)
2 I think lunatic cult are lihzahards who never gave up in moonlord
3 they also build a dungeon of sort
4 the golem is like moonlord with feet because:
1 golem has destructible hands and head
2 golem ejects a body part when you destroy his hand and head
3 golem you have to destroy his core
also the music is just a place holder for the real music that they might get and probrably just themed that redigit thought made most sence