Yes. A known expert in the field with credentials that far outweigh yours says the charges are very serious. Serious enough that handwaving it with "lol fake news" isn't going to fly.
Also, under what circumstances in a closed-door meeting with Russia after firing the person investigating your ties to Russia, does the idea of giving classified information to Russia before our other allies become unthinkable? Does the fact that multiple Trump appointees put out basically the same denial change much?
Sorry, but this is not something that can be handwaved. "Lol fake news" won't cut it here. Trump's conduct with Russia no longer permit that.