Welcome!
Yes, that's a "100-series" model. It was made in 2007. (That's the only year they put "LA" on the front and had model numbers ending with 0 at the same time.)
Age aside of course, the specs are equivalent to the 2021 S170 (which just appeared on deere.com recently) or 2020 E170.
The limitation of tractor capability is the transmission. The 100-series uses low-end transmissions. The LA140 uses the K46 trans specifically. Technically, you'd consider the 100-series a riding mower, despite the fact that it looks like a tractor. Another way to say it is "lawn tractor" as opposed to "garden tractor", where "garden" implies doing a little bit of digging/ground-engaging. The 100-series is designed for mowing flat suburban lots of an acre or less. The trans doesn't like hills, so any kind of grades on the property will put extra strain on the trans.
There's a reason Deere tractors go over $10,000 easily - it's the capability. The units sold for $3000 or less are really just mowers. For more heavy duty pulling/digging or even mowing hills/inclines, you would need to spend more.
The 100-series works well for what it's designed for. Go outside those limits and you'll have problems. The K46 has a very bad reputation online, but that's due in large part to people overworking them. If it's gently used on a flat lot, it works just fine.
