不是.第二个that引导的从句是定语从句,因为它可以改成：
He should consider the procedure carefully.
所以,先行词在从句里是做宾语,所以是定语从句.
记住,同位语从句的定义,就是先行词=从句.比如：
The news that he is sick was shocking to us.
the news = he is sick
敬请采纳.