LSP API available in IntelliJ IDEA Ultimate 2025.2 without paid subscription

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Excuse me, could you clarify, if my understanding is correct?

Assuming that a user is using 2025.3 of….

PyCharm / IDEA OpenSource Version: NO compatability with plugins relying on the LSP API.

Unifield ClosedSource PyCharm / IDEA without ever having had a paid subscription before: Compatability with plugins relying on the LSP API ← ???

Unifield ClosedSource PyCharm / IDEA Version with an active paid subscription: Compatability with plugins relying on the LSP API

Thank you very much!

Edit: For PyCharm this posts seems to clarify my question: Update on LSP and Template Language APIs in PyCharm