But as a side note: If Wakshani said, the speed modifier is not applied anymore (don't know what he said, just understand it this way out of your statement) then we shouldn't use his drone table either, right? Because it also wasn't printed by the people in charge. In this case we shouldn't use anything of the freelancer's words in total.
The speed modifier to chance to hit is in the printed vehicle rules in the last chapter of Rigger 5.0, so I'd take it as gospel.
And I'm not saying to discount freelancer's words. Just when the freelancer says, "I suggested these changes" in the development process and those changes weren't applied, to me that heavily implies that his suggestion was deemed not to be the way the designers want. If you're looking for clarification on how a certain rule works, the freelancer is totally the right person to go to.