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When you sit on the bike... the rear swing arm comes up putting the chain at a different angle than it is when the bike is sitting (no weight on it). That is also why you must adjust chain tension with your weight on the seat... to ensure the suspension is compressed and the swing arm/chain is at it's riding angle.
That first picture of the bike sitting on the side stand... no weight on the seat... the chain looks way too tight. That could easily explain why the chain is eating the roller so fast... too tight.
Also... that one picture of the chain roller... the metal mount for the roller doesn't look like it got welded on properly... allowing the roller to not sit as high as it should be. Which would lift the chain a tad higher and it would probably clear the swing arm.
Hopefully someone with a TMEC/Denali can confirm that roller. But don't forget to properly check/set your chain tension (with weight on the bike).
Cheers!
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