This is a great rowing workout to break up a big meter target, like the kind you might have during a rowing challenge. Keep in mind that heavy cardio, even on a rowing machine, will eat into your strength over time unless you balance it with off-erg work.
Do this series again if you need more meters, and scale down the off-erg reps as needed. Sub the rowing machine for the SkiErg on the last interval if you don’t have access to a SkiErg.