There's something to it, but I'm not sure what. I've had springers that need a few "warm up" shots before they'll settle down and group properly. Not a big deal if you're just shooting paper, but really irritating when you miss a starling that you KNOW you should have hit. I think it may have something to do with the lubes taking a set between shooting sessions, and needing a few shots to free them up. I also suspect it's worse with guns with loose tolerances that rely on heavy tar to tighten things up, but that's just a theory, no actual data to back it up. Don't know what the shooter from your quote was shooting, but it's been my experience that this is only impacts the first 4 or 5 shots, if he had to shoot a long string to settle it down, I'd say he has something else going on. Later.
Dave