It's a statement of fact, which is neutral on its own.
Where it becomes a right wing talking point (or a discussion about the socio-economic future of a country) broadly comes down to how you present the causes, implications, and necessary actions.
The fact that many more-developed countries having shrinking native populations is a fact that governments must reckon with in some way, and salting the earth on discussing because one faction is trying to exploit it cedes the ultimate policy decisions to them.
Where it becomes a right wing talking point (or a discussion about the socio-economic future of a country) broadly comes down to how you present the causes, implications, and necessary actions.
The fact that many more-developed countries having shrinking native populations is a fact that governments must reckon with in some way, and salting the earth on discussing because one faction is trying to exploit it cedes the ultimate policy decisions to them.