No, this time deinterlace doesn't make much difference.
When back in summer I reported a similar issue there were 2 ways to fix it:
1) By switching from Advanced deinterlacing to Bob.
2) By raising "vcgencmd arbiter set arm_uc". Setting it to "12 0" completely fixed the issue.
Since the very first kernel 4.9 based build the video corruption dramatically increased with no apparent way fo fix it.