No, there are plenty of Wifi 40-amp 240 volt smart controllers; they are listed as swimming pool controllers, and they are reasonably priced. Here are a couple of examples:

https://www.amazon.com/Suraielec-Controller-Powerful-Electrical-Appliances/dp/B08VS7SRHN

https://www.amazon.com/DEWENWILS-Outdoor-Wireless-Controller-Compatible/dp/B07PP2KNNH