I think their usage of the word Hanafi is in the literal meaning (as in monotheist) and not the common ('urfi) meaning, as in an adherent of the Hanafi mathhab. They seem to employ this lexical strategy to confuse the Hanafi laity. I presume not all Salafis recognise this and therefore criticise the Al Kauthar crew because of this. Their are also various strands within the Salafis and the criticism might be based on this. I know some Salafis who are particularly vocal in their critcism of the Al Kauthar and Al Maghrib lot.