I don't know what the situation is in Texas, but I knew some people in other parts of the country and I spent the weekend calling electrical engineers. What I found was that the NERC report is probably right on the money for most of the country. There is enough time left, and what they are finding is not that disturbing. The people I talked to just aren't finding any problems in chips where the clock function isn't used, and they are finding very few problems with the systems that do use dates. Very soon now someone is going to say out loud that you don't really have to check every chip or system if a hundred others just like it have been checked and nothing has turned up.
Electric people have a lot of experience dealing with outages.
A former engineer for Pacificorp told me that when there are five generators in a plant, all are independent of each other so that one or more can be down at any time. If time is pressing and if your consultant budget is a little thin and your plant people tell you they have a work-around, you might just put checking those three units on the back burner. Electric plants are like the railroads. They are old technology. I have checked the RR switches on the main line near me and none of them have chips, just big bronze padlocks, probably the same ones they used when my father was a boy.