To some extent the intent of the author matters, and in their "Just buy a license" pitch[1], the Qt company implicitly threatens lawsuits for GPL violations _if_ you use the open source version and fail to provide an adequate means to switch out the linked binaries. So the people who could enforce a copyright claim are drawing that distinction, which means it does matter here. In addition, they mix licenses between GPL and LGPL, so failing to take proper care means you could be relying on a GPL module and think you're ok by complying with the LGPL.
[1]: https://www.qt.io/licensing/open-source-lgpl-obligations