I got my Symbiotic Gauntlet on my first run after the update, max stats, also got the Chrono Key and Song of Vigor on the same run.
I farmed for Vyn’s Quiver after that, had it drop twice before getting max roll.
Also got the Mini-Singularity Launcher from the Varelsi Maligner, max roll, and two Mag Daemons from two runs.
I would also like to point out that the belief that certain drops only appear on advanced is incorrect as I’ve gotten both drops from both Vyn and Arc on normal. I have no proof of this though so you’ll have to take my word, but there’s no definitive proof to suggest that certain gear only drops on advanced either and I believed that until my own experiences.
Edit: I’m not saying anything bad about your guide by the way, I think it’s excellent, but that one part seems to be incorrect for whatever reason. You’ll have to test for yourself to prove me right or wrong, and with the increased drop rates that will be easier, perhaps it was correct before the increased drop rate update? I seldom farmed before then so I don’t know if anything else changed.