And the US military today is more advanced than the US military of 1991. But of course, you have to try to mislead the readers.
I used the word "relatively".
China has made more progress since 1991 than the US has and so the gap has closed and it is getting smaller as we speak.
One example should be the fact that China already has 2 5th generation fighters in testing whereas it was years away in 1991 from testing a 4th generation fighter and the US already had thousands of 4th generation F-14/F-15/F-16 and F-18 in service.
That example shows that at least in terms of the air-force the gap has closed since the US only has 187 F-22 that is a generation ahead of 500 or so 4th generation jets the Chinese have. Granted the US could have produced maybe 500 F-22 if they wanted to but so could China have produced hundreds more J-10's in response.