@Mary419,
I think you meant to say that I didn't include the comment "whenever feasible" in my paraphrase of the policy, and not that I didn't fully read it, because that would be incorrect and unsubstantiated assertion.
I based my stance upon more policy guidelines than the guest must first contact the host to give them an opportunity to fix the issue. According to the policy the guest may be entitled to a refund of the remaining unused nights, "If the guest decides to vacate the accommodations because of the Travel Issue and contacts us we will offer assistance with finding comparable or better accommodations for the remaining nights of the stay."
I find it highly unusual that a guest wouldn't have asked for a refund or relocation assistance when they decided to leave early. @Meghane0 said that she received the refund request five days after check-in, and there was no communication from either the guest or Airbnb between nights 2 and 4 of the booking. So, technically the claim submittal didn't fall within the policy guidelines as stated in the following.
"How claims work
To be eligible for rebooking assistance or a refund, the guest who made the reservation may submit a claim by contacting us. Claims must be made to us no later than 72 hours after discovery of the Travel Issue and supported by relevant evidence such as photographs or confirmation of the conditions by the Host. We will determine whether a Travel Issue has occurred by evaluating available evidence."
When the updated refund policy was announced one of the more frequently mentioned concerns was about the consisted adherence and application of the policy guidelines by ABB. If the CS rep read the part of the message thread between the guest and host where the host states that the cleaners were re-sent (and no response from the guest), basic critical thinking skills should have deduced that the guest cannot now say that they've not returned to space since departing on day 2, and claim that it's still unclean without having been there. What proof did the guest provide to Airbnb that the space had been inhabitable since they've never returned after their departure?
Honestly, this refund claim of an odor smells like it was something taken from this recent article about Air Cover. Only that @Meghane0's guest is taking it up a notch in an attempt to get a full refund by saying they departed after the first night.