I think Celeste was popular enough in the indie space to get "big developer". To put some words in OP's mouth, its not "Big Developer" as in a large studio. But "Big Developer" as in well known and acclaimed.

It's the same developer as Celeste, but in the article they talk about "city of none" [0], that's a yet unreleased game they're working on right now.

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  0: https://cityofnone.com/

In the article they make that 2025 is a tipping point where open source frameworks and libraries "just work", making speedy, fun development possible without needing to fight the clunkiness of heavyweight engines.

And any new stuff regarding Celeste or from their devs will forever be relevant to me! Highly recommend to any who haven't played it.

How is it not relevant? Celeste wasn't exactly a pinnacle of bleeding edge technology when it came out.

If I remember correctly it was a team of 2.