There are two kind of this but the style is similar. Only the text differs. (they indicate either Unlocked Bootloader and different OS installed) but as @Volker said you can not get rid of it easily. (maybe there are hacky ways with root or or so but not worth to go that way just for this)
About:
Even I did not confirm that myself in the linked thread, but sure I was and I still connected to the internet. Different WiFi networks, mobile data etc. … and there are more FP6+ users with the issue out there.