It's not really tempo deafness you're talking about, analogous to tone deafness. That would mean you'd be unable to recognise the right rhythm for a piece you are accompanying . And I can think of a few people who do that all right. The ones that get bodhrans a bad name.

Failings in being able to put a name to it and so forth are literacy problems. More akin to the way people who can speak perfectly well can have problems in recognising the different letters, p's and b's and so forth.

Or in a musical context, there are plenty of people who can sing and play well, but who just can't cope with tuning, and really can't tell which of two close notes is higher or lower.

I'm not sure if my virtual inability to make sense of any written music is a form of musical dislexia, or, more likely, just that I've been too lazy all my life.