You are reading your link wrong. They are deprecating 2.5-preview models. 2.5 (including lite) are up till at least sept/oct 26.

gemini-2.5-pro has a listed shutdown date of "June 17, 2026" in the linked table.

(Another commenter pointed out that this is the earliest shutdown date and it won't necessarily be shut down on that date).

Where are you getting sept/Oct from? I see gemini-2.5-flash-image in October, but everything else looks like June/July to me?