it's not been close since.
https://en.wikipedia.org/wiki/Arsenal_F.C.%E2%80%93Chelsea_F.C._rivalry#Honours
International competitions Arsenal Chelsea
UEFA Champions League 0 2 UEFA Europa League 0 2 UEFA Cup Winners' Cup 1 2 UEFA Super Cup 0 2 Inter-Cities Fairs Cup 1 0 FIFA Club World Cup 0 1
National competitions Arsenal Chelsea First Division / Premier League 13 6 FA Cup 14 8 League Cup 2 5 FA Community Shield 16 4
Total 47 32
So lets see. Arsenal is 15 titles ahead. 12 of them are community shield [lmao].
While Arsenal is ahead in total number yes, and also ahev absolutely dominated 20th century, Chelsea have dominated 21st century.
So its a bit misleading to say its not close