While CNN has reportedly issued new guidelines around the use of the phrase "The Big Lie" on air, it continues to appear prominently on both CNN and MSNBC, as seen in the timeline below.
CNN and MSNBC have both mentioned the phrase heavily.
In contrast, CNN does appear to have reduced its use of the phrase in its onscreen text.
Overall, CNN has displayed the phrase in its onscreen text for more than 45 hours over the past year and a half.