I don't think those Sean Yates quotes tell us anything about whether or not they have a heavy reliance on power meters during racing, it just tells us about their tactics.
The pros don't need a power meter to know when they are riding at threshold. Power meters are for gathering data and improving training efficiency. Most people who are experienced at training and racing will have a very good idea what their threshold power feels like.
I don't think those Sean Yates quotes tell us anything about whether or not they have a heavy reliance on power meters during racing, it just tells us about their tactics.
The pros don't need a power meter to know when they are riding at threshold. Power meters are for gathering data and improving training efficiency. Most people who are experienced at training and racing will have a very good idea what their threshold power feels like.