Absolutely, without hesitation, yes. More than yes. It is ideal, for the price. You couldn't do better.
50,000km is nothing. If your informant is telling the truth, this means the engine is in the first quarter of its life still. Barely a teenager.
For general info see:
For a fascinating account of a trip on a TA see:
(You might find some bias in my assessment of the latter link).
The TA was discontinued in the USA after a few year's poor sales: it just wasn't what the biker population wanted at the time. No one had heard of adventure biking then.
An early TA will give you something like the off-road abilities of the 650cc class of singles (like the KLR650 for example) with a far far better road ability.
Two cylinders means the engine power doesn't die out mid range like a single, but just keeps coming. 90mph cruising is possible.
It has a very low state of tune, so the engines are very smooth reliable and last a long long time - ideal for you.
North America has lots of long open roads. It was the one place I thought my Transalp absolutely ideal. It was fine on the interstate when I wanted to blast through the boring bits, and great on the small roads.
If you are very keen on riding dirt roads, or intend to spend most of your time in central america (where the roads are much smaller) then the TA is on the large side.
The price is about right.
Around the world 2000-2004, on a 1993 Honda Transalp