I'd play.
I love it when the GM is enthusiastic about the game and the setting.
Enthusiasm is a lot like sincerity- if you don't have it, ya gotta fake it.
Deep lore settings are a double edged sword... They can create a shared space in which to adventure
If no one is into the lore, its value is dependent highly upon the mechanics and how they're used.
If any of the players are into the lore, but the GM is ignorant¹ of it, it turns alt-hist almost immediately. ANd can be pretty damned ugly if the players are unaware.
If the GM is into the lore, but the players are ignorant¹ of it, it can be either a constant learning situation, or it can be a "Can we get on with it?" situation.
If everyone is into the lore, GM and players alike it can be great or horrible... if the system supports the setting as understood by the participants, and everyone's close on their understandings of it, it can be wonderful.
If everyone's into the lore, but don't actually understand it in the same way, it can be intensely problematic.
If everyone's into the lore, but the system used doesn't fit, it can be problematic.
And occasionally, the whole group may be ignorant, but the system supports the lore mechanically, and directs them into play compatible with that deep lore... I've had that thrice... Mouse Guard, L5R, and Pendragon.
Good lore-heavy settings with good games can lead players and GMs to delve into the lore, too... as I did with MG, L5R, Pendragon, Traveller, Mystara, WFRP, and 40K...
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¹: ignorant in the technical sense: lacking meaningful &/or useful knowledge. No derrogation intended.