I was laid off this morning being told my position was being eliminated. I later found out that my position is being filled by someone else.

This morning I was laid off over a team's meeting being told that my position was being eliminated. Attached is one image an email from HR going back over some of the things we discussed and including my severance package. Later I found out that an email was sent by my boss company wide second image) about filling my position with another person. I'm pretty sure this is illegal but can someone shed some light on this for me?