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If you look at the examples of bad crosstalk in Pritchard's paper, the bad cross talk is only 5 or 10 percent of full level.
The NTSC spec for the Q signal modulation is
Less than 2 dB down at 400 kHz;
Less than 6 dB down at 500 kHz;
At least 6 dB down at 600 kHz.
There was no spec for the frequency at which it should be 20 dB down or 26 dB, or whatever would be required to make the crosstalk unnoticeable.
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