DD's dad sent her a Christmas card in the post which was received today. He had written a short note saying that he had hoped to see her before Christmas but he been unwell. He then says that he's going for a checkup in a couple of days but 'it's nothing to worry about'. The rest of the note just asks about how she's doing at school - seriously he spent a third of the card space asking if school is going ok then two thirds saying he's been unwell.
AIBU to think that if it is nothing to worry about then there is no point in mentioning in?
For context DD is 11 and her dad and I have been apart since she was 18 months. Until two years ago we lived in the same rotten as her dad but even then he only saw her three or four times a year (not by my doing - believe me having no family nearby i would have welcomed the break). We moved again this year and, although he knew we were moving, he changed his phone number so I couldn't ring him 
to tell him our address (not that that would have made a difference to how often we saw him).
When he finally got in touch with us it was on his birthday (despite him not calling DD on her birthday) and telling DD that next year she can send him a card.
He didn't even send DD a present, just the card. As far as I am concerned he can fuck off to the far end of fuck. What was the point in sending the card? !?