It's not a typo, historic changes in sea level are in the hundreds of meters, from over 100m below current levels (in the relatively recent history) up to a maximum of perhaps 200m. A lot of that is to do with shifts in geology - configurations in the continents, levels of continental shelfs etc, but there's about 75m of potential increases which are locked into ice-sheets, glaciers, etc, and/or dependent on thermal expansion. Of course, even under the most catastrophic scenarios seeing increases on that scale would take thousands, probably tens of thousands of years.

I'm just trying to illustrate how absurd it is to say "oh yeah let's return to the climate in the Cretaceous, everything would be lovely".