Hi Yarik,
I'm Amr, an independent advisor.
if you purchased Minecraft Bedrock Edition on PS5 or any platform, you can't get it on PC for free after purchasing it on a different device. Unfortunately, this is not possible.
This is because Minecraft: Bedrock Edition is sold and licensed separately on each platform, and transferring licenses is not possible as each platform has their own marketplace.
The offer that you will get Minecraft Bedrock Edition or JAVA Edition if you purchased the other version is only available for PC versions
As for your second question, the deadline you are referring to is likely the account migration deadline, which ends on September 19, 2023.
This means that if you have a Mojang account, you need to migrate it to a Microsoft account before the deadline to continue playing Minecraft: Java Edition.
I hope this is helpful. If you require any additional assistance, don't hesitate to respond to this.
Best Regard
Amr