No, despite the fact that chat problems lasted for the better part of a year, you only get the 500k on your highest SP character on accounts that were Omega as of March 20, 2018. If you subbed two days later, for instance, well, the jokes on you.
If you believe you were subbed on that date, and did not receive the 500k, check this thread for more info (towards the bottom):
When will Skill Points for Error of Chatting System be given?