Not being in Ireland does not mean I don't know where the President happens to be today.
I suggest you learn a little about Mr Roberts' work before you decide what he does and does not know about genealogy.
I'm sure Mr Roberts is a fine genealogist. But an expert on Irish sources, which can be, shall we say, challenging?
I'm also sure that many readers here are quite well aware that President Biden is in Ireland today. But how many are aware that he is actually visiting a Heritage Centre today? (i.e. family history research centre). Other readers may be interested to know that, even if you seem to find that information somehow insulting.