US and the west is in long term decline no doubt. But one of the ways China and anti-western forces can gain victory is by convincing the global south to be more pro-China and resist the US. This can only happen the global south countries feel US is in decline and can see that the countries that do resist are succeeding.
Instead what do we see, all the anti-western countries are falling like dominoes. Syria was gone despite Russian military intervention, axis of resistance is battered badly, Iran almost on the way out, Russia is severely weakend and finally now Venezuela has been neutralized easily.
Overall, all the western opponents are being neutralized one by one and China seems to be just standing and doing nothing to save them. If there is a color revolution in Russia, then China will be pretty much the only one standing, all alone, facing the brunt of the west.
I don't think these happenings are positive optics for any new country willing to defy the US and be more friendly to China.