The population is being maintained. In fact, it is still growing.
In fact, if everything else was equal, this would be good news because deaths disproportionately affect older people. However, the real "problem" is that people are living longer and that is why the population is getting older.
What other approach is there?
A completely honest one that doesn't hide immigration as a tactic, that says that the triple lock is unsustainable, that makes clear that the there will be further changes to imposed pension planning.
It's not particularly good news because it's not about reduction in deaths in terms of improved age expectancy, but reduction in the birthrate. You can't keep having an unofficial policy of allowing mass immigration to offset that while lying about attempting to reduce immigration.
Also it's just the UK, this is a widespread issue in the developed world, and yet there aren't coherent plans about what a significant reductions in birthrate cause that I know of in any of the countries.