Ok, yes, just because his neck ties in low to his chest does not necessarily make for a front heavy horse, but this horse's balance does.
To help demonstrate this (the lines are not perfect, my first time trying this on the iPad)
The pink line is as close to level as I could get with the app I was using, the purple line shows this horses balance from hip (representing LS) to the Cervical Curve of the neck (well, it isn't totally accurate because of how low the horse's head is, but even if we imagine it up higher, it won't be enough to make it match the level line). This is signifying a front heavy horse on the very structual level.
I added the green line, which is almost level, to show the horse is not visibly butt high, as we are generally trained to look for balance this way.
I did one of my horses who I would also say ties in a bit low up front, but is more level in overall balance. (being a little downhill is not a huge detriment, and most horses actually are!)
Again the pink line is as close to level as I could get, the purple represents the horse's balance (this line is actually looking a tiny bit higher than it should, but was as close as I seemed to be able to get) and the green line actually shows him as uphill by a little.