Is nobody here practicing, suwari waza in depth anymore! Juat a point
I'm sure there are plenty here that practice Suwari waza, although whether it is 'in depth' depends on what you mean by this..
Suwari waza and grappling, or more specifically ground grappling are to me very different things indeed.
Due to the diversity of opinions of what is and isn't Aikido on this site there will be those that will disagree with this - I can only speak from personal experience and always happy to read alternative views and consider them of course.
(This assumes your point was to draw some parallel between the topic and Suwari waza)