My understanding is that G100UL is based on the same 94UL that 100LL is based on, but with different additives instead of TEL. I don’t know much about Swift, but I thought it was based on bio-renewables.
In any case, don’t confuse the growing movement of trying to eliminate ICE-powered consumer vehicles with eliminating fossil fuels altogether. That’s a significantly bigger and complicated issue, and I don’t see it likely affecting aviation for quite some time. Certainly well beyond 2030.