We'll see if Dennis chimes in....
I 'think' that might either be
A) His most recent SVX that ended up having some issues
or
B) One of the ones he looked at several months ago but ended up passing on because it too, had issues
These cars are really getting to the age now that, even with low miles, if they haven't been carefully maintained, they are going to have surprises.
Not to say a car like the one in the ad is a bad deal, if the condition is as advertised and a good price can be haggled, just that the buyer should be someone willing and able to put possibly thousands more into it in the coming months/years to keep it running. It's still a good starting point (Perfect paint job, interior, newer parts...).
Dennis can definitely attest that it is no longer safe to spend $5-$8K on a pristine "looking" SVX and expect that you won't have to touch anything on it mechanically for years to come.