All very strange…
If one doesn't have a track saw, there are surely numerous other, cheaper things than a Festool guide rail that one could use for this purpose… such as a piece of wood (cut on the table saw which, in the example shown, one already has) and screwing some simple clamping device to that. Since the 'grip-strip' must surely be removed, this seems a dreadfully extravagant use of resources.
And what supports the other edge of the lumber? Not another guide rail, surely?
Or am I missing something?