The vocal uptilt --at least in common native-English dialects-- turns statements into questions, and/or indicates that the speaker seeks agreement or approval from the listener. Do it here and there and it's no problem. Do it for every sentence and it's very off-putting, and distracts from the content itself.
It's not radically different advice from not saying Umm every two words, not mumbling/eating half your sentence, not talking to a room in a whisper, etc.
No. We're still (relatively primitive) animals: we have plenty of well-documented "vulns" and internal biases that affect our decision-making and opinion-forming abilities - and these come from both actual-instinctive habits (like how we're generally predisposed to be biased towards selecting tall people as leaders or for promotion) and learned biases from our cultural upbringing (e.g. racism in the southern US).
I hear a lot of bullshit from people who focus on how they sound. Can't authority be established through work history? TBH, the more polished and confident a presenter sounds, the more likely they are to be actively bullshitting, and it's really annoying to see people fall for it "because he sounded so confident."
If you are ignoring someone's point because of the sound of voice, rather than quality of content... Yikes. I guess certain silicon valley-isms (e.g. Theranos) start to make sense if people really do that in a corporate setting.