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The previous owner isn't telling you something more than likely. I wouldn't be surprised if the car was in a non-total front end collision that activated pre-tensioner.
The pretensioner (not 100% sure if its this way on the frs but for the most part they are all the similar) is basically a one-time use mechanism that fires (literally..there is a pyro-charge inside that once fired, it shoots a metal tension cable) off during an impact (even if airbags don't deploy). This sucks down the BUCKLE where the seat belt snaps into. Once this happens the resistance that value changes and the car knows that its been deployed, hence the code you are seeing.
To check it, you'll probably need to unbolt the seat and take a look at the buckle and see if you can find whether or not its been activated.
Hopefully that isn't the case, but either way isn't a HUGE deal.. Are you able to pull out your seat belts perfectly fine? There are companies on ebay (I think one is in GA) that you can send this assembly into to have it reworked/recharged. Alternatively you can just source a belt/tensionser assembly from a wrecked car on ebay.
With regards to the code, this isn't a simple "check engine light" as it pertains to safety and you can't just simply reset it with a basic (sometimes not even with a more sophisticated ) obdii computer. The wrecked 2015 Buick Lacrosse that I fixed had the pretensioner fired and belt locked up, so I just found those as a set on ebay for 60 bucks. I was able to use my buddies more sophisticated obdii reader to clear the code (it also will only clear if the issue is fixed, you can't just delete the error). But sometimes, depending on the severity of the impact, these codes can get HARDWRITTEN into the SRS computer (this too probably can be flashed through the same company who can rework the pre-tensioners).
If I have scared you completely at this point, thats OK, but this could be something as silly as the plug to the pretensioner being loose or broken or something. But either way, you'll need to get in there and see what it all is looking like visually.
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