I do back-end work work for a couple of fairly knowledgeable people in the SEO field (i.e. not people off the street just claiming to be SEO experts). One of them is advising that HSTS improves SEO, while the other asserts it makes no difference.
I have found some articles on the web talking about HSTS and SEO, but it seems to me that they are low quality articles, or articles pushing an agenda. The best take-away I could get from these articles is that SEO reduces page load time by doing away with the time for a 301 redirect. This does not make sense to me as I would assume that Google would just index the HTTPS site.
Does anyone have insights into whether Google takes HSTS into account when doing SEO, and relatedly, does implementing HSTS preload have any impact?