No. As I pointed out in another link, there were too many outages for transmission to cover it.

For example, California "only" has 10GW of north-south transmission capacity. TX lost nearly 45GW. Even if it was part of the East or West grid there wouldn't be the transmission capacity there to cover such a loss, plus the states closest to TX which were "connected" were also having major outages, which would have put even more strain on it.

TX does have HVDC interconnects to other states too, but I believe imports to TX were significantly down/zero over this crisis.