Texas could at most with the new link take 4500 megawatts that’s not enough to bring down a grid with 100,000+ megawatts of spinning reserves. You want to bring down a grid freeze out the natural gas supply that’s 43% of the total grid that’s how you bring down a grid.
Texas only lost the 40K megawatts because the grid itself was failing to keep in sync. That would damage infrastructure, and forced the whole grid to shutdown. A relatively small amount of extra power was all that was needed to stabilize the grid and prevent that from happening.