Welcome to the forum.
These engines often last 2000+ hours, or ~25-30 years (whichever comes first), so 224 hours is Very Low hours. Too low hours is sometimes a concern because it was not used often enough to keep moisture out of the engine internals + keep bearings and seals lubricated, etc. However, if this boat was really garage stored always (as the ad claims), then that should more than make up for it.
This boat also has Snap-in carpeting, Not Glued-in. I'm not sure about 2001, but in the late '90s, it was optional. Snap-in is far superior to glued-in because it means you have a fiberglass floor. This keeps water from going into the wood below, as long as all the screw holes were sealed.
The "Garage Stored" is the biggest feature here. Keeping the boat dry and protected from the Sun 99% of the time greatly extends the life of the Vinyl Interior, Electronics/wiring, Hull structure, Gelcoat, carpet, etc. In fact, it probably extends the life of some of these items by 3 to 4 times.
Looking at the pictures, the exhaust manifolds look like the originals (probably time to replace). The thermostat housing looks new or repainted. The Alternator looks like new (might have been replaced, and if they did it looks like they used a factory replacement which is a good sign for their maintenance attitude). The yellow bracket above the fuel pump does is not rusty like my 2000 is...which is a sign that it might not have been in a salty environment (and was kept dry as mentioned above).
The rust on the trailer does not look bad at all to me, because it is only where the paint gets scraped away at the folding tongue? These steel trailers rust from the inside out because they are not painted on the inside of the tubing. There are some drain holes in the bottom where you can stick a finger and feel the inside. Some rust inside will be normal, but you do not want to find large chunks of loose rust inside. If you use this trailer in salt water, you will probably only get another 1 or 2 years out of it as I did. If you only use it in fresh water it might have a lot of life left.
Ray
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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings