For the question "Is the plan to add them back to the website at some point?":
The deprecated and legacy SDKs for the G2 4K series will no longer be add back to the website and are not planned.
For the question "Based on the roadmap and previous documentation, you were planning to support the SDKs until the end of 2022. Is this still the case?"
Yes. The Deprecated and Legacy SDKs will remain supported until the end of 2022.
For the question "Was there any announcement about the website removal? How can we be kept into the loop of such changes? Where are they shared?":
Sorry, currently there is no announcement or sharing information about the website removing the SDKs.