Yes, i read the link, and i am astounded, it is not impossible to prepare things in an asceptic manner, so why not formula?? This is the first time i have ever been told this and i have always let my boiled water cool down before i added the formula (found it mixed better) - this is clearly something that people need to be made better aware of. I know the instructions say used boiling water, well i think they recommend letting it cool too (not sure) but they need to make it clear that this is important.
As to whether this is important in a 2 year old or once you start weaning anyway. I mean, you don't steralise their food. So i guess that this advice is probably only pertinent for so long as sterilisation is necessary.
I personally think we worry far too much about sterile this and antibacterial that, and i often think it causes more problems than it solves. The problem with all of these antibacterial sprays, soaps and handwashes is that they are indescriminate, that destroy everything, (pretty much) and that means the "good" bacteria too. These good bacteria, because they are harmless live on and in our bodies in high numbers. When we come along and zap them with the new all singing all dancing, kill everything in its path, antibacterial soap, we kill these too. That then leaves the playing field open for more virulent and resistent strains which before were kept at bay by the bacterial that normally sits there quite happily in the first place.
So, if you want healthy kids - let them have filthy hands, let them pick something up off the floor and eat it (five second rule of course), let them make mud pies and don't have a anuerism if they put some in their mouth. My DD loves nothing more than playing in the garden when im working out there, she likes to collect the worms, and we collect the snails regularly to carry over to the alley - i don't stand vigil with a baby wipe, so i daresay she puts her hands stright in her mouth (thumb sucker) and she is hardly ever ill - so i dont think im going to threat about a few bacteria that may or may not be floating around in her formula.