Hi Kieran! Yes, Rocket League players on Switch can still play online, but only with other #RLonSwitch players. Cross-platform play being disabled on Switch is only temporary until v1.44 is live on Switch in a few days. (Date and time to be announced soon.) https://t.co/4OaTCgluOh— Rocket League (@RocketLeague) April 11, 2018
Let's hope that update is indeed coming in just a few days. I know there are plenty of Switch players out there who are ready to show off their skills to players on other platforms!