It's not just the interviews, but attending all those parties, studio networking events, private luncheons, events that are not usually in the public eye or open invitation except to the industry insiders. I think there's some validity to that - Kathy is a veteran in the Oscar circuit, she knows how to work these things. JLo, while a popular celebrity, is new to all of this - this is basically her first award shows circuit. And she is also currently filming a movie and preparing for the SB halftime show. So her absence in these events might as well have been to Kathy's advantage. I just didn't think that JLo is the one in the bubble for missing a slot, and not someone else. She has been a strong #2 choice ranking this season, behind Laura.
I think the power of campaigning did affect the acting nominations (or lack thereof) for the cast of Parasite despite figuring on the big Oscar noms. When assessing the chances of Song Kang Ho, Cho Yeo Jeong and Lee Jeung Eun for potential acting noms, pundits refer to the ladies of Roma breaking through and that the same could happen to the Parasite actors, a "friendlier" and more engaging movie to watch compared to Roma. But Roma had the huge backing and campaigning power of Netflix behind it, while Parasite had a Korean production company and a small, indie US distributor. The latter does not have unlimited resources like Roma did.