Did the devs lie? Yes and No
Is blu too OP? Again yes and no blu can invalidate both the hlr role and the tank role but as a dps it is just average at best this needs the biggest boost to warrant being a limited job as stands its limited due to 1kN,MG,DB and WW and that isn't good enough reason for it and how many of us remember the titan-egi vs Ramuh ex making tanks obsolete for awhile
What did the devs lie about? "Solo-oriented job" this is untrue you can have a max of 23 abilities solo (1 start, 16 Overworld without needing a friend, 4 totem abilities, 2 mask carnivale) that leave 26 needing someone to do duties/way higher overworld mobs they should've advertised blu as a "solo and party job" showcasing that you can do some solo masked carnivale and ability hunting but advise players you may need to group up to tackle some of the harder abilities showcasing primals/dungeons