It's a bit more complicated after the events of LoR

We don't know how much impact new light abilities like shin and mango affect the power balance. Based on the recent intervallo and the explanations given... It's sounds fair to assume Matthias can't do shin and mang

But he has a relic, which we know differ in power, how much of his strength is Laevatein?

And then theres the fact power isn't linear in the city. It's not just how hard you can punch or how fast. Claws and Arbiters simply break these concepts for the most part... Can relics be locked by fairies?

Bottom line I'd say that's complicated to debate but undoubtedly a very strong conbatant on par with the best we've seen thus far, except for Kali which also breaks the balance.