I’d call it ‘caution’ rather than ‘skepticism’. Part of the cause for caution is that Bax is identifying the Voynich plant drawings as familiar, time-honoured plants from the Herbal tradition. But they’re so badly drawn that as mindfu pointed out upstream, another theory centres on identifying them as Central American plants.
Bax has certainly done his homework; he’s aware of all the pro-hoax arguments (e.g. the statistical properties of the text), and addresses them in his paper.
