I’d say хз (the last one) is still used very commonly, but the rest are a bit outdated and I barely see them anymore.

Another thing I thought was outdated but some of my friends use is shortening common words. “I like” would be “мне нравится” and some people save themselves a second and write it like “мне нрав”.

And another thing I just thought of is “etc” equivalent in Russian, “и т.д.”, this one is used officially in documents etc, it’s a shortening of “и так далее”, literally “and so on”. And some people simplify it further by writing “итд” without spaces and dots.