I can't say how odd it might be in tiny biotech (never worked in tiny biotech), but, from experience, it is not so odd in tiny tech. I was once simultaneously a chief technology officer in a legal arbitration firm, a chief science officer in a pharma laboratory software development firm and a lead developer in a third which did the actual heavy lifting under contract to other two. All tiny startups, and worth leaving as soon as possible except the layers who paid well, so I stayed in contact. Totally different field(s) from biotech, I know.
I take regulatory officer meaning a person responsible for regulatory (FDA) contacts and company's adherence to GxP. NanoV was pre-clinical stage company running mostly non-GLP stuff during Menon's time - there probably was few, if any contacts to FDA. What was Menon doing there? Sleeping?