Here is a link to a YouTube video of someone that was through that stretch four or five years ago. It looks tough, at least then.
portage from hell I went near but not through that area in May (2023). While we were camped on March Lake, we met a park portage crew who checked our permit. They said they had come down from Quetico Lake via Robin Lake etc. and cleared the portages you are asking about. The most recent portage maintenance map posted by Plander in this form also says they were cleared in May 2023. I said to them that I'd heard that that area can be a spot where it can be tough and there might be a lot of wading. They smiled and nodded as to say yes indeed.