The implication is that Sony is presently shipping software with Busybox and knowingly violating the licensing terms. If they rewrite Busybox in the interim they will be able to get away scot-free despite their years of flagrant copyright violation. Given the variety of devices Sony ships and their complete lack of respect for the GPL, their plan could very well work unless someone catches them red-handed.
And the point is that the people who wrote Busybox don't want money if you're infringing their copyright - they just want to see exactly what you've done with their code, and get the chance to play with it. Which is pretty reasonable when you think about it.
Sony is presently shipping a lot of stuff with Busybox in, but they are not violating the license terms. Here you can download a zillion Sony-patched versions of Busybox to your hearts content: https://products.sel.sony.com/opensource/source_tv.shtml
The "2010 and later" section is empty. I guess it's possible that they stopped building new products which use GPL code in 2009, but somehow it seems unlikely that they stopped updating or patching old ones at the same time. If it takes them two or more years to ship the source, after they're already shipping the binaries, are they in compliance?
And the point is that the people who wrote Busybox don't want money if you're infringing their copyright - they just want to see exactly what you've done with their code, and get the chance to play with it. Which is pretty reasonable when you think about it.