That’s also generally frowned upon and something I was pretty sure was in the rules until Quik and I looked at them a few seasons ago. It’s also in place to generally avoid teams dumping cap space to rebuilding teams in exchange for taking it back at a slightly later date. In general, like you said, not a huge deal.
With @Quik on vacation I discussed it with @Will and we agreed to amend the rule to the following:
6.7 – Reacquiring a Player Previously Traded
All trades involving a player being re-acquired by a team that traded them within the previous 2 seasons, including the season in which they were traded (i.e. if they were traded in S68, S68 and S69), will be subject to extra scrutiny by league administration. If the trade is found to have malicious intent that is damaging to the league (such as a temporary cap deferral arrangement), the Commissioner's Office reserves the right to veto it.
So this trade will be allowed but in the future please don’t try to just get away with things that are against the rules. We’re way more likely to allow things if you just come to us with them instead of breaking the rule and then trying to argue it’s a dumb rule.