The way I read that article, which matches with my understanding, is that you may find both the “aborted” variety of E. abortivum that looks like a shrimp, and the mushroom variety of E. abortivum itself that looks like a typical stem and cap mushroom. If you find the aborted version, you know that the species you are looking at is E. abortivum (but which has infected a honey mushroom). If you find the stem-and-cap E. abortivum, it looks like a pretty standard entoloma mushroom, which are a genus that is notoriously difficult to identify to species. So if you attempt to eat the stem and cap version, you should know what you’re doing! I haven’t heard of issues with the aborted varieties themselves, but these things change all the time
I don’t eat a ton of these, but I do eat a few every year. Like any other mushroom, you get a feel for when they’re at their best stage, and these do get “styrofoamy” after a while and can get destroyed by bugs too.