My mechanic can still deliver all of these vehicles to me. He just delivered my tow truck and it STILL disconnects people, so yeah. The catch is, though, you can't store the truck in your garage using conventional means (you get the "This vehicle can not be stored in your garage" message).
I still have everything - tow truck, jet, tank etc. What I haven't done yet is looked at my garage - I haven't been inside of my garage since the patch dropped. I'm afraid that if I go inside, my vehicles will only then disappear, and I won't be able to get them from my mechanic.
So yeah. DO NOT go in your garage yet, wait to see what other people report. You might be able to get a car from your mechanic and glitch it back in, but have your other glitched vehicles disappear. Choose wisely I guess?