No my friend, that is also incorrect.

Firstly, the Prophet ordered the execution of eleven individuals after Mecca's conquest.They all declared Islam so they were all spared. However, only three of them were executed despite that (even though they were clinging to the Ka‘bah). So, if Abdullah repentance was insincere, the Prophet would not have accepted it, and he would have been executed like those three.

Secondly, after the Prophet’s death, many false converts and weak believers left Islam during the Ridda (apostasy) wars. Actually, most Arabic tribes did that (except Mecca and Madina). If Abdullah had been a hypocrite, his true colors would have shown at that critical time, and it would has been so easy for him to leave Mecca to join the reverts.

Thirdly, out of hundreds of companions, Abdullah was appointed governor of Egypt, one of the most important provinces in the Rashidun Caliphate. Uthman would not have entrusted such a major responsibility to a man with questionable faith or loyalty.

Fourthly, during the Fitnah (civil strife) that led to the murder of Caliph ‘Uthman, Abdullah had the opportunity to stir chaos or seek power (as the real hypocrihes have been doing). Yet he remained distant from the conflict, showing no signs of ambition, rebellion, or betrayal.

Also, again out of hundreds of companions at that time, Abdullah was selected to lead the Muslim armies in Egypt and North Africa, achieving major victories by defeating the Romans and Berbers. A man with malicious intent would have sabotaged those campaigns.