Like I've said previously in this thread, the Chinese foreign ministry has played this dire warning card over and over in the last few years to the point that the US has just straight up ignored it this time around. Is not the fact that she is landing that's the main issue, it's that the US has disregarded multiple last ditch warnings from low level military intelligence all the way up to President Xi's personal warning. If all that eventuates is again stern warnings then who will respect the One China policy?
They needed to meaningfully escalate to deter the US, this might mean landing ships in the water, carrier battle groups moving closer, large air patrols crossing the median line, but none of those eventuated.