The comment from Radak is referring to Lot. השבע is not referring to The Seven, but means that Lot had satisfaction in Mitzrayim. They provided him what he wanted materially from life. In spite of that, Lot did not want to remain in Mitzrayim and separate from Avram.
This same idea continues in Bereshit 13:10-12 which points out how Lot ultimately chose the territory around Sodom over the balance of Canaan because it was like Mitzrayim.
This is in contrast with Avraham, who rejected what Mitzrayim offered, like is pointed out in Bereshit 14:17-23 when Avram rejects what the King of Sodom offers him as a reward for his military victory.
The essence of this is that Avraham trusted that G-d would provide for him materially with whatever he needed. And this is the meaning of Bereshit 15:1, where Avram is promised that G-d will be his shield and his reward would be very great.