He's all in on super tuesday and it will be interesting to see how it works out.
You could always discuss how important they are (and it may also be very different), but it has been the kickstart of some winning campaigns throughout time, and especially Iowa is seen by many pundits up there ranking just below super tuesday as it can create a major buff.
But well. History is one thing. We can't predict what will happen and what it will cause.
But Bloomberg not focusing on those states could just as much be a matter of realisation. He entered at a point where other candidates had already met a ton of Iowans, meaning that he would be behind from the start. By dropping those 4 states (Nevada and South Carolina as well), he has more time touring the next states (and posting millions into ads). It's not the first time somebody tries with this strategy (Giuliani did pretty much the same in 2008 though he was on the earlier ballots), but it's hard to say.