The fully diluted share count includes all shares that could be held by people if all the vested compensation plans were exercised (worst case $/share). The float is only shares that currently exist. The fully diluted number needs to be less than the authorized (max) share count which was recently increased to adjust for the planned 3 for 1 split.That last paragraph doesnt mean those shares are unissued. It means those shares were issued only for the purposes of the plan. In other words: they had to issue brand new shares for the plan, as opposed to, says leftover shares from a secondary offering.
The plan required sufficient unallocated/ unissued shares to be available (reserved). As they vest they are added to fully diluted. As they are exercised they are issued and added to the basic count.
Invalidating the 2018 reduces the fully diluted number and increases the number of non-allocated/ not issued shares.