These airless transfers are what anyone should be doing, if they want their beers to age less quickly. I was moderating one of the sessions at an AHA Conference a couple of years ago and the speaker was presenting on reducing oxidation in the brewery. While sitting in that presentation I finally recognized that the simple setup to push beer out of the fermenter with CO2 into a pre-purged keg was something I knew I could do.
I was consistently having problems with my beers suffering from oxidation effects after several months. I installed a male gas-in fitting to my conical's lid and I began filling all my kegs with sanitizer and pushing the sanitizer out with CO2. Its made a remarkable improvement.
I should have made that change years ago!!