Been following this thread and I think the confusion comes from mixing up two different things: "does Google use raw CTR numbers from Search Console/Analytics as a ranking input" (almost certainly no, that data isn't reliable enough to trust) vs "does user click behavior in the SERP influence rankings" (almost certainly yes, just not the way most people picture it).
Google has denied using GSC-style CTR data directly more than once. But that's not really the mechanism people are talking about when they bring up clicks. What actually seems to matter is relative behavior at the SERP level — if your result gets clicked more than expected for your position, and people don't immediately bounce back to search (pogo-sticking), that's a pattern Google's systems can pick up on through things like Navboost, which has come up in leaked documentation and antitrust testimony. It's less "clicks = ranking points" and more "clicks are one data point Google uses to sanity-check whether a result is actually satisfying people."
That's why you'll see pages with mediocre CTR still rank #1 for years — because content quality, links, and topical authority are doing the heavy lifting, and click data is more of a secondary filter than a primary driver.
Practically, I wouldn't chase CTR as its own goal. I'd treat it as feedback: if a page ranks decently but nobody's clicking it, that tells you your title/meta isn't matching intent, which is worth fixing regardless of whether Google "counts" clicks directly. And if people click but leave in two seconds, that's telling you something about the content itself, not the title.
So basically — not a direct lever you can pull, but not something to ignore either.