I'm guessing this was probably meant for
#C19V5U41Z channel, but you can find the lifecycle documented here:
puppet.com/products/puppet-enterprise/support-lifecycle
Support for PE 2025 has already started (as of its release in 2025 and will end when the next 'latest' comes out after PE 2026 (which is predicted to be in August 2027). So PE 2025 will have 2 years of support.
I agree it's not clear right now (or rather, is not stated at all) if there is still a 6-month overlap period. My understanding is there is no overlap period.
So in your situation where you would prefer to stay on the stable releases that do not get new features, you would transition from PE 2023 to PE 2025 at some point after August 2026, and then to PE 2026 when the subsequent (planned to be PE 2027 in August 2027) is released.