That's highly inaccurate. The gyroscopic effect is not everything, but it does get stronger at higher speeds. That's why even a simple wheel without any frame o

That's highly inaccurate. The gyroscopic effect is not everything, but it does get stronger at higher speeds. That's why even a simple wheel without any frame or steering mechanism will run mostly stable at high speeds. So when going at high speeds on a bike, it indeed is more stable than when going slow. The article you link only claims that the gyroscopic effect is not everything stabilizing a bike.