Was this a flop cbet?

plo20 - clubgg min vpip 35

Hand converted by PokerTracker 4

Hero (BTN): 100 BB
SB: 148.15 BB (VPIP: 60.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 7)
BB: 145.25 BB (VPIP: 66.67, PFR: 33.33, 3Bet Preflop: 0.00, Hands: 4)
UTG: 133.6 BB (VPIP: 82.14, PFR: 17.86, 3Bet Preflop: 7.69, Hands: 39)
CO: 106.25 BB (VPIP: 100.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 6)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♠ A♥ 9♣ 8♥

UTG calls 1 BB, CO calls 1 BB, Hero raises to 5.5 BB, fold, BB calls 4.5 BB, UTG calls 4.5 BB, fold

Flop: (18 BB, 3 players) 8♦ 7♦ 2♠
BB checks, UTG checks, Hero bets 11 BB, BB calls 11 BB, fold

Turn: (40 BB, 2 players) K♦
BB checks, Hero checks

River: (40 BB, 2 players) J♣
BB bets 40 BB, fold

Was this a flop cbet?
Or we should just check back?