If FreeBSD should be notified in this case, even though they aren't really in most of the high impact areas, should OpenBSD be notified? What about QNX? What about OpenSolaris? Apparently Joyent got late notification as well[1], and since they actually are a cloud provider, I think they have a much better case for being notified before FreeBSD.
In the end, if there's an information embargo there needs to be a decision about who's in and who's out, and most times there will be some excluded party that really wishes they were included. You can't make everyone happy, but I don't think FreeBSD really needed a huge advance warning, given what it looks like Google's criteria was for notification. The fact the hyperthreading bug that keeps being referenced was handled differently seems to me to be mostly an artifact of a BSD developer finding the bug.
1: https://help.joyent.com/hc/en-us/articles/115015938847-Secur...