@drebelpai the reason is that 6.5 will only enter the LTS phase after 6.5.3 is
out.
That is, for the first patch level releases, any LTS release is just a normal release, with both open source and commercial sources being available. But after Qt 6.6.0 is released, Qt 6.5 normally wouldn't get any scheduled updates anymore. This is where the commercial-only LTS releases come into play.
You also notice that in the screenshot: There's a lts-6.2.5 branch, but no lts-6.2.4 branch. This is because Qt 6.2.4 was still a non-lts patch level release (see also https://wiki.qt.io/Qt_6.2_Release).
Anyhow, I agree that the terminology here is confusing.
