Why would he think Kin emon is dead?
And obviously he's not just naming every single person who's ever been important to him lmao. As I said, he's naming those who specifically played a role in shaping his will to take down Kaido.
It's like Nami for Arlong. Usopp for Kuro, Robin for Lucci, etc.
They're the ones who are driving him to want to defeat the arc big bad. But in this case, Yamao is irrelevant to Luffy. Her struggles and pain matters...but only as much as the suffering of every citizen of Wano. The real people he's invested in are Momo, Tama, Kin and Pedro. He's doing it primarily for them. Yamao's just an afterthought. And supporting character in Momo, Tama, Kin and Pedro's struggles.