Epic, is Steam integration busted on OSX?

Since upgrading to 4.9.2 a couple months ago, Steam on the Mac is no longer working for us. It looks like we are not the only ones:

Steam Integration on OSX broken after 4.9 Update - Platform & Builds - Epic Developer Community Forums (my answerhub post with more info)

Is this the case? Is it fixed in 4.10? Is there a work-around?