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Can you ımprove your chess skılls by playıng ONLY bots (la questıon)

Playing against humans and playing against conplitors are two completely different things
It may teach you how to accurately convert a pawn advantage but it doesn't do a lot of the tricks in the position unless you blunder humans create a lot more unsound tricks which are harder to see
I don't think you can improve at playing humans by playing bots, because humans' and bots' play is totally different. Though I think you can improve at playing bots by playing bots. Just my opinion.
Step 1 : playing bots
Step 2 : playing human on lichess
Step 3 : playing otb

Édit : rating manipulator are not relevant because of step 3. You transfert your anxiety on step 3.
Step 1 and 2 are exactly same on lichess and chess.com. More 80% players use a bot/analyse support for play.

You will more improve against human (at amateur level) because you will meet more often same situation. The bot will play somes lines that you will see so rarely in live.
I was unsure about playing humans so played my first ever 100 games against the Danya bot & maximum engine

- I got destroyed in ways most players can't imagine!...but it left me absolutely unfazed at playing humans of any level
Beating a bot regularly for example 2500 bot will give you confidence that you have the consistency of seeing good moves both defending and attacking correctly.
As in all sports, a referee is needed. Online rating is bullshit. For instance,in my last game a player 1870 rating asked for takeback after a blunder.