Earlier quoted context omitted.
They _literally_ could.
How does one keep software proprietary while leveraging the GPL (aside from the case of not distributing it)?
1. You incorporate GPL software and hope that no one notices and/or no one challenges. This is the most popular approach, and it’s quite successful, actually. 2. You cease to be a proprietary software company. Less popular, but an option.
Both of these are literally possible.