Yes, that's exactly what it means. What they are saying is that this is an internally protected 3 phase motor, something not common in industry, and it therefore does not require an external overload relay be used with a contactor (or manual motor starter) that will not automatically reset. Or put another way, you could theoretically use this with just a 3 pole contactor operated by a selector switch or toggle switch with the t-stat in series with the coil, not a full blown motor starter. But if you do, the control switch remains closed so the t-stat will cool down and allow automatic restarting too soon and apparently this motor is not rated for that. Somewhat common in motors designed for specific applications, like OEM vent fans for example. If you notice, this motor is not UL listed, it is a UL Recognized component, which means whomever uses it must get the ENTIRE machine and control system listed after assembly, and that control requirement will need to be part of the scheme.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
� Kilgore Trout (via Kurt Vonnegut)