@Brenda328 He said the reviews were from 2 different hosts, not the same host.
@Jack1543 I consider all guests who send a message like that to be red flags, regardless of their reviews. I have gotten some exactly like that, which I responded to by asking if they had read certain crucial points in my listing info and asking them to tell me a little about themselves, and it ellicited more appropriate responses and the guests turned out to be fine. But those were booking requests, as I don't use IB, so that exchange took place before I accepted their reservation.
As you say this was an Inquiry (or was it a booking request?) all you have to do is write back to the guest (who, if he has 6 reviews, should understand that until you pre-approve or accept, he isn't "arriving in the evening") within 24 hours, you don't have to pre-approve or decline. If it's a booking request, you can still message with the guest as long as you click or accept or decline within 24 hours.
If you still feel uncomfortable with the guest's next response, or lack of one, don't accept the booking.
As far as the legitimacy of the reviews, you could click on the profiles of each of those hosts to see if they review all their guests with those standard ines.