Sport mode only I believe, I think the trophy's count is linked to your profile's stats (achievements), which is Sport mode only. So tough if you aim platinum indeed.
You're missing the point, it's not about preventing motorsports from polluting (ridiculous, we agree) but rather to encourage street cars to use less and less petrol power, shifting people interest into different propelling technologies and accordingly open wide the money valve for R&D. We just all forgot how motorsports were born in the early 20th and why.
Those thing that you're talking about, trucks and stuff, will naturally flow from this dynamic.
FIA does stupid things sometimes, and its presidence obviously has irrelevant stuff on its agenda, but in essence it seems rather correct to me. Conventional racing doesn't have to die suddenly, as long as there is petrol and enough money/interest, it will survive (for our greatest pleasure
).