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.
So green energies, delayed in the last decades for political reasons, will need to wait, again. And this delay could turn to be a very bad decision in a few years.
More research is probably needed, but I wouldn't say we have "no evidence".
And when we will do, it is too late to change our mind
Too late, to little and, with bad luck, a very expensive error.
Money is a limited resource. The only reason to tag nuclear as green is to grant nuclear access to subsides for green energy.
It is always much better to define objectively what is the issue and what is the aim. It seems to me that the main issue is emissions and that the aim is therefore to reduce them as much as possible.
In that context, nuclear is a perfectly valid option and probably unavoidable as things stand.
Gas is 'bad' since it obviously does produce emissions but it's the least emitting among fossil fuels so realistically it could also be allowed as a last resort (with 'last resort' underlined 3 times in red).