Huh? Hyundai has the fastest charging vehicles on the market thanks to the much higher battery pack voltage. Tesla's battery is starting to look behind the times.
Hyundai is definitely doing well in terms of charging speed, but they're still a bit slower than Tesla (220 kW vs 250 kW). The marketing is confusing here, as Hyundai cars need a "350 kW charger" to achieve their max charging speed, and so they like to mention that 350 kW number, but they don't actually have the ability to draw anywhere near 350 kW of electricity.
You need to look at the charging curve vs the peak charging rate. Teslas quickly derate from their peak rate.