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Rarely is someone alerted to this problem by the bike all of a sudden running poorly.
Most of the time you just don’t know what you’re missing.
The guy in the video has no idea his bike was running less than optimal…….until I fixed it and he replied “wow, the bike runs a whole lot better than it did!”
In your particular instance it’s possible that the VFC is making the bike’s mixture so rich it’s masking the air leak. Or, the parts were replaced a decade ago and there is no problem at all.
The bottom line is: don’t wait until the bike is noticeably running poorly to check it’s health.