Charger games have been on 98.7 since the 2020 season with their move to Inglewood's SoFi Stadium.
KFI was the primary station for their first 3 seasons (2017-2019).
The press release at that time (understandably) did not address Loveofradio's/TheBigA's questions of why they moved:
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Los Angeles Chargers Move To Alt 98.7 For 2020 Season
After having their games air on News/Talk 640 KFI during their first three years back in the city, the NFL'sradioinsight.com
My money (oops! sports betting's not legal in California) is on demographics. The Chargers would like for a chunk of their radio audience to be under 50 and they know that's less likely on AM. iHeart's going to want to keep that out of a news release because they don't want to say that KFI attracts an older audience and that younger people are less likely to listen to a game on AM.