Supra isn't a Toyota; it's a BMW, so it isn't exactly helping the case that Toyota is on the right development path. They have to use a partner for high performance applications since they can't be bothered to develop their own.
B58 is a truly great combustion engine, but the idea any turbocharged ICE can compete with an electric motor for input lag is ridiculous. B58's twin scroll turbos certainly reduce lag compared with more run-of-the-mill turbo engines, but even naturally aspirated race engines with light flywheels feel laggy after driving even low-end BEVs.