Cannot follow the link to your board but ... sounds like you may be looking at an older board designed for wave riding. Worst case is that if it is a 'sinker', it requires quite a lot of skill to ride.
Learn on a board with good floatation (relative to your weight). Could be an older centreboard type, or a newer, shorter wide tailed board with a large, single
Main deal is unless you have a substantial fin or plate you will loose lots of ground downwind as you learn. The fin / plate lets you claw
ground. But always learn on a lee shore!
A modern wide-tailed board will probably last you longer, plane in less wind, be faster / more fun once you have the basics, and let you learn how to gybe on the plane. People seem to learn pretty quickly on them.
A sinker with inefficient fins would not be a good choice.
Roger, AKA "NZL 83"