Only after it becomes yours. E-2 requires personal capital at risk, and money inside a corporation belongs to the corporation. A documented dividend, shareholder distribution or loan repayment moves the funds to you; alternatively the corporation itself can be the investor if it is Canadian-owned and you enter as its employee.
Decide whose money it is before deciding whose visa it is
The treaty investor must be a national of the treaty country, and where the investor is a company, at least fifty percent of it must be owned by treaty nationals. A family corporation owned by two Canadian citizens qualifies as a treaty investor in its own right, so one structure is for the corporation to buy the dealership and for Hank to apply as an executive or essential employee of the corporate investor. That structure has consequences for control, taxation and the eventual sale of the business.
The other structure is to distribute the proceeds to the couple and have them buy personally, which keeps the E-2 case simple: their own funds, their own ownership, their own direction. Which is better is an accounting question as much as an immigration one, and it should be answered before the purchase agreement is signed, because changing the buyer later means redoing the paper trail. In either case the source of the money, a lawful sale of farmland, is easy to document; the path is what must be built.