The honor code doesn't say "thou shalt keep everything, regardless." If you're talking about the unsourced dates just added, I'd give it a couple days in case the contributor comes back and adds a real source, but if the best that there is is "some tree on Ancestry.com says such and such", yeah, you're perfectly justified in taking it out. The accompanying message literally says "could you please confirm its correct" which doesn't make it sound like a confidently sourced datum.
For example, I just edited a profile where the Ancestry 1870 US census was cited as a source for the birthdate of a guy who was born around 1623. You better believe I deleted that "source". With Ancestry, a lot of the really nutso stuff happens when people get "Hints" and just accept them without looking at it or thinking too hard about it. The Ancestry hint AI is prone to making a lot of spurious connections, and people sometimes don't get that these "hints" are more like "wild guesses".