I mean if Marechera has to have a mental illness, as is the view of some, then why not this one?
After all, there is evidence for it. See the very beginning of his first published book:
I got my things and left. The sun was coming up. I couldn’t think where to go. I wandered towards the beerhall but stopped at the bottle-store where I bought a beer. There were people scattered along the store’s wide verandah, drinking. I sat beneath the tall msasa tree whose branches scrape the corrugated iron roofs. I was trying not to think about where I was going. I didn’t feel bitter. I was glad things had happened the way they had; I couldn’t have stayed on in that House of Hunger where every morsel of sanity was snatched from you the way some kinds of birds snatch food from the very mouths of babes.