Today quality of text to speech is amazing. They could have used a better service. Take a look at these samples https://wellsaidlabs.com/

i could not bare it after few seconds and muted it and read the auto-generated subtitles instead. it sounds really terribly annoying to me. its weird because otherwise this video appears quite well laid out and all but listening to it was destroying the overall experience of it for me.

I agree, the voice detracts from the experience -- but perhaps this was the best they could do under the circumstances. We don't know how good their command of the English language is, maybe they can't even tell how bad it is. Or maybe they're just of the Tik Tok generation and this jarring awfulness seems normal :)

I'm not sure which is worse, the robot-voice videos or the no-voice-waving-hands-music ones.

I kind of like the robot voice. Very soothing.

Less annoying than the tiktok voice somehow.