What part don't you get? If it's IMC, there is no legal VFR traffic. (full stop).
Reread the first 2/3's of
PlankBlenders' post.
I agree., there shouldn't be VFR rated folk inside IMC, but there can still be legal VFR traffic
underneath that IMC.
heck, even an overcast base at 4000' could have an IFR descend on top of a VFR who's inbound on descent from, or climbing to, just below that base.