Yes, because it only evokes a nice sentiment if you lie about how it was made. Magic tricks are still fun even if you know they're tricks. This is not at all fun once you know it's a trick.
Even if it's inherently considered dishonest by some, the same should be vigorously argued for all email/snail mail you have received for decades and frankly I can't remember the last time I've seen someone complain about a personalized email being dishonest.
"I am amazed by the customer service...It makes me very happy that the team is so invested"
"I can't imagine how much effort must go into doing this"
"This is the first time in my life that I receive a personalized video from the founder of a company"
"This means a lot to me"
"I really appreciated the personal attention"
"I don't know how you have the time!"
I actually find the act of doing that far more manipulative than automated thank you videos.
1. In no world would I ever believe that a cold email was significantly personalized/targeted, except if the overall content were highly specific to me. This might be wrong a good portion of the time, but it is what it is.
2. Even if I were 100% unaware of the existence of AI/ML, a video wouldn't change my mind about #1. I would be more inclined to think that they'd recorded themselves rattling off a list of customer names and then stitched that into the main video, or just rerecorded the same video hundreds or thousands of times. The latter would take some dedication, and be a pretty big waste of time, but it wouldn't convince me that the sender knows or cares more about me personally.
3. Including a video message in an email in itself is uncommon in and of itself, personalized or not. If the technique increases conversions, this alone could be a sufficient explanation. To the extent that the personalization does further increase conversions, it's equally valid to hypothesize that a novel tech demo catches their attention as it is to hypothesize that people are being deceived. Personally, I would lean toward the former.
As an aside, even in the promotional video on Windsor's home page, the videos are kind of uncanny valley. May not be a big deal if the recipient doesn't think too much of one word being slightly garbled because the remaining speech sounds natural, but I'd be concerned about it completely butchering some names (particularly longer ones).