Earlier quoted context omitted.
I haven't seen a report of 4000 civilians injured. I have seen a report of 4000 people injured across the two attacks, but presumably some fraction of these are targets. 42 killed, of whom Hezbollah said 12 were civilians (later admitting some of the 12 were fighters). Historical average is about half of the wounded or killed in conflicts to be civilians. < 12/42 would be a relatively "good" ratio.
You didn’t see 4,000 because you didn’t look for it. It’s literally in the wikipedia article linked in the thread you’re responding to with multiple associated citations.
You make an assumption that of the 4000 people wounded /all/ were civilians, which is odd, considering that explosive was in a device given out to Hezbollah members.