The things that are allowed by this law are fairly tightly specified, as even the article gives various details on:
> new nuclear and gas-fired plants built through 2030 will be recognised as a transitional energy source as long as they are used to replace dirtier fossil fuels such as oil and coal.
So, limited to the next 8 years, and only in places where they're not going to displace cleaner options.
> gas projects should only be financed if direct emissions are kept under a maximum cap and they switch to fully renewable energy by 2035
I've not read the legal text but this latter part likely refers to gas turbines that can run on methane or hydrogen or some mix of the two, which is a fairly standard part of forward planning.
There's some political shenanigans involved, but overall it's a fairly sensible compromise and another small step in the right direction.