IBU have standardised their spellings without diacritics in the last few years. They used to inclde all the umlauts and accents etc., but since about 2014 when they updated the Datacenter they put all the data in there without them. As a result Boe follows suit with Bjoerndalen, Goessner and so on. They even had Maekaeraeinen for a bit, but then reverted to Makarainen even though that's incorrect, because the spelling was so unintuitive. I think Tarjei Bø was already spelled as "Boe" before that, though.I recognise that the letters æøåäö and others are not as easy to pronounce for a native English speaker as they are for a Scandinavian/Nordic citizen like myself, but I expect a commenatator of winter sports to take his/her time to the get familiar with the letters and names. I have never understood why the Bø brothers for instance have to be pronounced closer to bow and that their names can't even be spelled the correct way on the screen (Boe is just stupid).