The Philippines is part of the NAM, so they are not aligned with any major power bloc, but they have had a historical relationship with the US which is exactly what China had been worried about and why its looking to counter that in order to diminish the influence the Quad has in the region. This recent relation with China is new in terms of its scope as the Philippines has been looking to move away from American influence recently. I think you might be underestimating the threat to which China is actually facing, we've seen the sort of attempts made by the west through things like the HK protests and Xinjiang and how they've escalated recently, as well as with Tibet and the Indian border. China is by no means a regional hegemon, and it still faces continual conflicts, so its understandable that it would need to have relations with all countries in the area to maintain influence. I'm not sure theres any such simple solution to this, China is going to follow its interests in surviving and developing.