So far, your example has not been my experience. I was laid off by a toxic manager yet my team, at least those from the original team still left from the prior manager, threw me a going-away party. My badge was good for the 30-ish days between the middle of the first week of Aug '11 to the Friday of the 2nd week of Sept '11. Did they cut off all my admin access and access to a lot of tools/servers, yes. But I could use the VPN to access my email, I could look at internal job postings, access HR/benefits/ESPP, and I could print resumes, etc.
Then after my six-month black list was up, a great manager from a team I had partnered with on projects with my old team contacted me and asked if I wanted to join his team. I did, and it was great until he left Cisco and after 4 yrs, I was let go again in '16. Again, my badge worked, I still had VPN access to email & the HR/benefits site. Like the first time, my admin access was revoked. They also threw me a going-away party. Actually, my current manager at the time took me to lunch on his Cisco AmEx card after giving me the bad news that morning. And he expensed lunch for me and the guy who had to take over my work so we could have a working lunch to do a knowledge transfer. I think we spent 30 min bookmarking several wiki sites where documentation was, copying scripts from my workspace to his, etc. and then had a 2-hr lunch on Cisco's dime.
I can't really say anything about getting kicked out of WebEx rooms because it wasn't a thing back in '16 or before, and I was glad they removed me from meeting invites because who want's meeting reminder's popping up on your phone that you can't/won't go to because you're on terminal leave for that last 30 days and not expected to work.
I think my teams treated me fairly well even if Cisco was pretty callous about it. Although, on my first team, one of the new guys who joined after the toxic manager took over didn't have the decency to wait out the full 30 days before I was completely terminated and moved into my old cube/desk and tossed out the stuff I had left behind after I left the first day. I'd come in the night after getting informed of my new status and cleaned out all my "personal" stuff, but I'd left behind a lot of Cisco swag that I wasn't sure if I wanted to keep or leave behind and he'd made that decision for me by tossing it all out by the next Monday. That was cold. And neither the manager or HR gave a sh-t about him throwing away my stuff because "it appeared that I'd abandoned it" even though I still had 3 weeks left to clean out my desk.
I will say, that this toxic manager treated one guy on our team that left for a competitor as a security risk. He had us disabling his admin accounts, checking root cron jobs, etc. for any ticking time bo--s that he might have left behind to delete stuff once his accounts were terminated and taking manual backups immediately to compare to data from several weeks ago to see if any "jobs" had been modified maliciously.