AC is correct.
In motorsports few seconds is a very long time. The lap times are not mentioned.
The raceway in question is probably this: http://thunderhill.com/staticpages/index.php?page=TrackMap
But which variation? Long version 2.866miles record times tend to be just over the 2minute mark for somewhat normal cars.
Short version is 1.769miles for which SCCA website is missing the record times, the medium version is 1.814miles and record times tend to be close to 1:30 mark with somewhat regular cars.
Also they don't say how good race car driver was the AI against, there is a huge variety of race car driver skill levels.
Few seconds? They are being vague, i bet it was more than just 2 seconds because they are being vague.
Some racing series have 3% rule to qualify, ie. within 3% of the best time, for 1:30 lap time that is 2.7seconds, in other words this AI wouldn't even qualify.
All that being said, great work! Got to start from somewhere.
In theory AI could become better than humans, but then again AI will most likely always lack intuition, so could well be that a human will always surpass AI.
Nevermind that a very highly skilled human with very high motivation can do some insane reaction and completely remove the guesswork some of the time when surpassing the limits, ie. see Ayrton Senna. For AI we'd need sensor capable of few ms polling rates with data returned, then compute all the data within few milliseconds and then some insane fast and accurate servos to achieve that level.
Few millisecond polling rate doesn't sound like much until you realize that for example USB has 90ms, PS/2 is in theory capable of 5ms, and serial port even faster, but that doesn't account for data transfer rates.
There's a reason why we cannot even build a simple ECU/EMS with standard off-the-shelf hardware: Polling rates are too slow.