I think the intention has been to avoid the suggestion that there's been a fallout and leave the door open for him returning in January, but the choice of phrase is very, very odd.
There's an element of "damned if you do, damned if you don't" with this. Everyone complains when the statements don't have any detail, and now we're complaining again because the detail in the statement isn't right, but ultimately that's the difference between good comms and bad comms.
Interested to see if we get an explanation from McGlynn in his next interview, and how much detail he goes into.
Either he's been shipped out because he can't cut it, or he's genuinely being sent out for ten weeks to get his fitness up. Right now, the former would seem much more likely than the latter.