the abstract of the PDF provided in the link has more commas. (not sure if any of the terms mean anything though. i know jackshit about any of this)

someone fucked up the commas

https://arxiv.org/abs/2102.08928

this is my impression. back when i still was in academia it would pop up from time to time but i never published there since i never cited any of their journals in the first place. (why would one publish there when all your peers are somewhere else). nowadays i sometimes get requests from them to my personal email for special issues which i just ignore. (it’s academic spam essentially).

have a look at retraction watch https://retractionwatch.com/?s=mdpi

some might regard it as a predatory publisher

thank you for your work. although i don’t post here i really appreciate the community and the work that involves. thanks a lot

simple vinaigrette. Olive oil, French mustard, vinegar, salt, pepper (garlic, shallots). depending on the salad it’s wine vinegar (red or white) or apple cider vinegar, Dijon or à l’ancienne mustard. if i feel fancy I’ll add some herbs (tarragon is great) or some egg yolk for extra creaminess.