Can Google downvote a site due to Ajax on the page?

Question

Google

Hello everyone, here's what I've come across. There is a website, the first domain for almost a year then transferred to a new one for almost 6 months. I came across this, since the site-service for downloading videos from tik tok without a watermark, made for the convenience of users the functionality on the main page, it is enough to insert a link and ajax will send a request and immediately return the result, everything is fast and convenient.

I have been promoting the resource all this time. Things are going well with Yandex, but Google basically does not even give the top 50, I have already checked many options, done a lot of things and corrected them. But a couple of weeks ago I noticed the following. In Google, 90% of sites are recognized as a failure, apparently since everything is on one page, a link is inserted, a file is obtained and downloaded, and the person leaves the site. Because in Yandex.Metrica, the bounce rate is usually not higher than 15%, and the users themselves tracked, sit on the page and even download 2-3 videos.

And that's what I did, now the link is inserted into the main field, it is expected for 1-2 seconds and it redirects to another page, and from there the download starts.
I’ve been watching for a week now, in the very first days, as I did, the bounce rate in Google fell to 10-15%, and most importantly, the site began to receive positions and almost every day I observe some pages higher and higher in the search results. I would like to hear from experts, is it really because what I essentially made it more convenient for users actually worsens everything for google issuance?

Answer 1

Well, only Google knows for sure, and they won't tell us.
And so, from the point of view of logic, it seems that you argue correctly.

Answer 2

I would like to hear from experts, is it really because what I essentially made it more convenient for users actually worsens everything for google issuance?

Yes, IMHO, because google does not perceive one page as a site at all, it considers that a site is when there are many pages interconnected. Therefore, the bounce rate thinks so, and therefore the landing pages are poorly promoted.
As a result, you made a website out of one page, and things got more fun)