Just reviewed the link. It presumes an actual distribution from the IRA(s) and a 60 day rollover. If you do that, you must be very sure to decline all withholding from the IRA distribution.
It is better to do a direct rollover (IRA check made out to your 401k plan FBO you). That eliminates the withholding risk and having to deposit the check and write your own check. But either way is acceptable and neither counts as a rollover with respect to the one rollover limit per 12 month period.