Unusual names for Yellowstone geysers are by no means uncommon (see Impatient Miser Geyser, Peanot Pool, etc.), but this one is odder than most. According to T. Scott Bryan's book The Geysers of Yellowstone, the name resulted from the (understandable) observation that there were too many thermal features named "Teakettle," so that an attempt was made to delete the names of some of those features on official maps. For some reason, the instruction to "delete" the name of this feature, previously called Teakettle, was misconstrued as an actual renaming, and the name stuck.
Whatever its name, this has been a fairly frequent performer during 2016 and 2017. Intervals as short as 10 minutes have been reported, and average intervals are probably not much longer than that; the much longer intervals and mean/median interval times reported on geysertimes.org no doubt result from Deleted Teakettle's small eruptions simply going unnoticed or unreported. Bryan does mention that a "15-foot eruption is visible in a photograph taken in 1915," but modern eruptions do not reach anything near this height, in general.