You're still misreading it. You even bolded the part that you're confused about.
The deal might be reconfigured to gain a trade exception. But in this case, it can't be done.
Here is a more complicated example of a legal non-simultaneous trade: Team A is a taxpaying team with a $4 million trade exception from a previous trade, and a $10 million player it currently wants to trade. Team B has three players making $4 million, $5 million and $7 million, and the two teams want to complete a three-for-one trade with these players. This trade is legal -- the $5 million and $7 million players together make less than the 125% plus $100,000 allowed for the $10 million player ($12.6 million), and the $4 million player fits within the $4 million trade exception. So the $4 million player actually completes the previous, non-simultaneous trade, so Team A is left trading its $10 million player for Team B's $5 million and $7 million players in a separate, simultaneous trade. From Team B's perspective there is also a simultaneous and a non-simultaneous trade -- it aggregates its $4 million and $5 million players to acquire Team A's $10 million player in a simultaneous trade, and it sends the $7 million player to Team A for "nothing" in a separate, non-simultaneous trade, thereby receiving a $7 million trade exception.