Why wouldn't it be relevant?
It's basically the major resistance that brought bitcoin down to less than $10k last time. Based on this recovery I think we're going to go near that figure this year once again and potentially challenge the old all time high.
How it's going to go though is unknown. It's way too early to tell at the moment. So there are no guarantees to if $20k will actually hit. We're on a pretty bullish trend right now and the run-up could take us to around $15k or so before a correction. After that correction, if the trend stays bullish, then we'll have a real shot at $20k.