It depends how much of a purist you are. A "real" tube can mean that there are absolutely no semiconductors (including op-amps) in it. But then, if you're such a purist as to not want any semiconductors in the signal path, forget about using any pedals or signal processors of any kind in your rig or else there will be no point in being **** about using a "real" tube amp.
Anyways, onelastgoodbye, when you refer to "gain" I assume you mean "distortion". Usually, the op-amps in these programmable tube pre-amps are just used to buffer, sometimes equalize (for voicing), and adjust the signal to optimal levels for the tubes to use. So the op-amps don't clip the signal or directly contribute to the distortion; the tubes provide all the distortion or soft clipping. So, unless you're really **** about it, you can say that the MP-1 is a "real" tube pre-amp if all the distortion is actually supplied by the tubes even though the signal goes through a few op-amps.
On the other hand:
The op-amps are usually used to replace the first few tube stages of a pre-amp where very little distortion occurs, but those early tube stages can add a certain warmth to the signal, nevertheless. And many tube amp experts will say that the pre-amp tubes in these first stages are the most important.
So decide yourselves what you consider as a "real" tube pre-amp. To me all this is only semantics.