Yes, this is because conventional wisdom assumes that monetary velocity stays constant (it has been dropping instead).
Basically, it comes down to who actually gets the money generated by an increase in M2. If it's people with a low propensity to consume / buy things (i.e. the rich), then extra M2 is not inflationary (caveat: not inflationary for goods. It's inflationary for stocks/real estate/etc instead, since that is what rich people "consume").
If it's people with a high propensity to consume (i.e. the average citizens), then it is.