In this case, I take the patch message to mean that woofer literally spawned ON TOP of the table in the room at some point in classic. I could swear the first encounter I had with Mangler was in the year 2000. I was noobing around Rivervale as a freshly minted halfling druid, and I rounded the backroom corner in Kevlin's shop to get surprise pounced by Mangler. At that time, he was certainly behind the wall preventing LOS. I'd welcome anyone else to give their recollection from classic.
In light of the link describing Mangler's /location to be (-147, -247), I took these pics on P99 this afternoon. I dropped an item at the /loc, which I MS Painted an outline in red.
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The view from inside the backroom
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The view from the entrance to the shop
Personally, I remember encountering Mangler on classic Live EQ at his current spawn point on P99. Were he to spawn on the tabletop, he would LOS aggro anyone entering the building, so I can only imagine what THAT ruckus was like.