I just drove I-80 to the US 6 interchange, and now US 6 is signed concurrently with I-80 and the signs for those following US 6 west approaching the area clearly indicate that US 6 joins I-80. So the signs have caught up with TM.
Added bonus: construction delays looked bad on I-80 so I had a good excuse to pick up US 6 from that interchange to where it rejoins I-80 near Atlantic. Quick, scenic, and relaxing drive.