A buy is a trade that takes place near the ask. A sell is a trade that takes place near the bid.
What where the bid and ask today at 4:09PM when the AH entry was made?
Any chart you have that says the AH entry at 4:09PM is a buy or sell is guesstimating based on something like the average bid/ask for the day or the bid/ask at 4:00PM.
By definition there are no bids and asks when the market is closed.