I'm not
@Random_Kurozumi but I will try to answer that, since I'm also one that wanted her in the poll.
Her getting older wasn't something that Luffy asked of her but becoming a little stronger. The idea is that, before the end of the series, the SH will meet Tama again and she will join for the last bit of the journey. Basically, a Jinbe return.
Her getting stronger does not mean getting to the level of a commander but being able to survive in the crew and help somewhat with the abilities of a ninja. Be the apprentice of the crew like Buggy and Shanks with Roger.
One of the arguments that I used earlier for my claim is that Oda could have ended her story cleanly in Wano, making her train with Shinobu and live with her horse-mommy. The fact that he made her get the promise to join when they next meet and made clear at the end of the wano that the country will be revisited again instead of ending her story, made it clear (for me) that is something that he will address in the story later.
Like, imagine if Oda had made Yamato declare that she would train Momo and them join when Luffy returns and Luffy agreed, instead of ending like he did. People would treat Yamato as a Nakama like Jinbe without question. But when Tama says that she will train and join when Luffy returns it is treated as nothing.
Of course, he can ignore this plot point and never address it (like he did with Tama/vegapunk connections) but it's a more clear Nakama connection than many people on the poll.