Actually almost every GBB partially pressurizes the blowback mechanism before they snap into recoil mode. Only Magna GBBs have a distinct pressurization of only the breech or recoil pneumatics. Even recent TM GBBs have a mid station reed valve which snaps forward. In the rearwards position, gas pressure is applied to the recoil assembly. If it didn't, there would be no pressure to shove the reed valve forward when breech pressure dropped.
If that video is of a TM hicapa, I'd say that the reed valve wasn't stiff enough. It looks like the slide starts its recoil just before the pellet exits the barrel in the 2nd video.
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