Never a good idea to jack on a bolt head. Can swell it then your socket may not fit.
I sometimes jack there but use a rubber pad.
I was actually a post from yourself that suggested lifting from that point. I wasn't really thinking about deforming the bolt, I was thinking more along the lines of putting all that load through the bush point. Maybe not a good idea if it's already become brittle and splitting..
I think that was possibly me that suggested jacking there Jocko.
IMHO, that point on the front subframe is an ideal place to jack the front suspension, it's very strong. I do use a thick rubber pad for jacking anywhere, as I say, but only because it avoids marking anything or damaging underseal.
You'll not damage the bush jacking there, you're jacking straight on to the front subframe, not the bush, The bush rubber is only bearing the weight of the suspension, and that's the same wherever you jack. The centre of the bush is pretty hefty lump of steel, the bolt likewise, and unless you're really careless, the bolt will sit inside the trolley jack cup anyway.