Whether a thin smear of lubrication on the sides of the piston seal and on the rear bearing surface of the piston is sufficient depends on what was done the compression chamber before the relube, as well as the objectives of the tune.
In my experience, a thoroughly degreased compression chamber does not typically get sufficiently lubed by the classic minimalist job descibed above. There will be too much friction between the piston contact points and the compression chamber wall for a high-energy shot cycle, since a tiny amount of even highly effective lubrication just isn't enough to lubricate the pretty massive surface area of the compression chamber. The gun will shoot, have a good shot cycle and fine accuracy, but a high-power springer may see a up to a 20% drop in MV.
This is not about dieseling, since I can hear and feel the extra friction of the seal against dry steel, and after a couple of shots even the minimally lubed guns have the characteristic whiff at the muzzle, no less or more than a gun that had compression chamber lubing done after insertion of piston. This is what I do to get my spring guns shoot the way I want them. A lazier option would be to do a less thorough degreasing job, so that the chamber wall retained some lubrication from the past, not enough for the piston seal to scrape to the front of the seal.
For reference, I have degreased and relubed a springer something like 100 times to date, covering some 25 different guns, shooting from 10 fpe to 30 fpe. A pro would do that in a week, but hey, it is something.
