Could be taken to be directed entirely towards pairings. But first sentence seems to suggest hinting at "Meta" compositions.
Though... What they've actually done, from looking at skills and what not from the Media Tour, is taken Bard and Dragoon out of the meta by removing their synergy and Bard's utility (Crit aura and Foe's Requiem) and replaced them with Monk and Dancer whom have great synergy and Dancer now has all the party rDPS buff utility now too...
Given that literally, the only "Synergy" jobs in the meta were... Dragoon being taken alongside a Bard (Or Machinist). For the Piercing buff. With the non-meta "Speed Run" parties having Black Mage benefitting from Summoner's Contagion.
Warrior was ran purely because Holmgang is the best Tank CD and Inner Release worked the best for mitigating boss downtime (Also, capitalizing on burst windows like Trick Attack)
Paladin was ran because Cover/Intervention/Passage of Arms were useful while OT
Ninja was ran because Trick Attack.
Summoner was ran because it did like 95% the damage of BLM but also had Raise and rDPS boosts.
Scholar was ran because it was the best healer due to shields being so strong vs certain mechanics (Also, rDPS boost from Chain Stratagem)
Astrologian was ran because it was WHM but with cards for rDPS boosts.
None of those classes have been changed, outside of Summoner losing Contagion (But getting a stronger Devotion).
Warrior will continue to be the best tank to capitalize on burst windows and having the best Tank CD.
Paladin still has an advantage in OT utility (Unless aiding the MT soak TB's is really important where DRK can shine)
Ninja still has Trick Attack.
Summoner still has Raise and rDPS boosts (So unless BLM pulls further ahead and/or RDM becomes competitive it will still be the go-to)
Scholar still has plenty of shields, if not as good to spread them out. Also still has Chain Stratagem (Albeit nerfed)
Astrologian is now doubling down on providing rDPS boosts with now all cards being damage boosts.
So yeah... For the meta comp, it's literally -Bard, -Dragoon, +Dancer, +Monk.