The punch table thing hasn't been true since 2007, now it's full body table but leg results hit the surface and do no damage.
Advanced Woods have all the same rules as standard woods; the only thing that changes are that the modifier accrues based on total distance. If any amount of the target's base/footprint is in woods, the woods modifier applies. If any amount of the attacker's base/footprint is in woods, the woods attack modifier applies. If the cumulative (across all intervening terrain features) amount of woods between the target and attacker (measure from closest point to closest point) is 2" or less, the modifier is +1. If the amount is greater than 2" but not greater than 4", the modifier is +2. If the amount is greater than 4" but less than 6", the modifier is +3. If the amount is 6" or greater, LOS is blocked.
It is possible to have woods modifiers apply even if the amount of woods physically in between two targets is zero if either unit is in any way occupying any amount of woods. This sentence applies to both standard and advanced woods.
Unless there is a very specific edge case I'm missing, anyone telling you something other than the above is wrong.