Yes, he is. The whole argument up to that point is the Corinthians arrogance because they have spiritual gifts:
I always thank my God for you and for the gracious gifts he has given you, now that you belong to Christ Jesus. Now you have every spiritual gift you need as you eagerly wait for the return of our Lord Jesus Christ.
1 Corinthians 1:4, 7 NLT
https://bible.com/bible/116/1co.1.4-7.NLT
I always thank my God for you and for the gracious gifts he has given you, now that you belong to Christ Jesus. Now you have every spiritual gift you need as you eagerly wait for the return of our Lord Jesus Christ.
1 Corinthians 1:4, 7 NLT
https://bible.com/bible/116/1co.1.4-7.NLT
I Corinthians 1:4-7 "I give thanks to my God always for you because of the grace of God that was given you in Christ Jesus, 5 that in every way you were enriched in him in all speech and all knowledge—6 even as the testimony about Christ was confirmed among you— 7 so that you are not lacking in any gift, as you wait for the revealing of our Lord Jesus Christ,"
Not lacking in any gift of salvation that is the context of 1:4-9, this introduction does not make chapter 4 to speak of spiritual gifts, chapter 4 is about false apostles, but it not your fault that you want to connect verses 1:4, 7 to chapter 4 because that is the way you are probably being taught the Bible that way instead of being taught the Bible verse by verse throught books of the Bible.
Why haven't you answered the question?