I'm at work and haven't read the article, but just based off of your question in the thread:
I would think they would train with whatever their duty weapon is.
The other question is who pays for it. Are the taxpayers going to foot the bill for integrally suppressed weapons just to keep the noise pollution to a minimum? Not in my neck of the woods. Our taxes don't even seem to cover road work anymore sadly.
They are indeed very cool pistols though!