Luffy blocked with adCoC...nonetheless, it is good feat...
No, it was just armament. This entire chapter was really about Luffy showing off his overall mastery of the 3 haki types. Oda drew him using each one atleast once, to counter/block a Kaidou attack.
1.Hardening to swipe away Kaidou's dragon twister.
(you can see the impact mark is not one of advCoC and Luffy is showing signs of slight discomfort "gah!", with advCoC the attack wouldn't have reached him)
2.FS to blitz Kaidou's TB
Luffy was already interrupting Kaidou before he could finish completing calling out Thunder Bagua, and to further cement it he laughs and says "take that" before he landed the kick meaning he had already seen the future.
3. advCoC to halt his swing
(you can clearly see the difference between this and the top panel when he swatted the slash with armament, the club never reaches him) before countering with the final attack.