the idea to doing your research is to anticipate where you will be received well, not to argue with those who turn you down because in theory it should have worked on paper. and once you have a reception -- and in this situation even standards -- you know exactly where you stand.
also, all due respect to this emerging line of posts, but whether you make a sports team is based on A vs. B now, not whether you believe you were faster in 10th or 11th grade and think you project out faster. no. he's saying with the college athletes on hand and their times, as well as any roster limits, this is what i need now. what the current runners did years ago is trivia if they run 152 and 415 now. you're not being recruited 2-3 years ago when they were.
you're not confused on the standards, it sounds like you're confused who you're dealing with. you thought on paper you had a home, but this is the response. you're more confused about the coach. if so, you either err on the side of this coach puts me off, or you talk to him again at some point and decide if you like the vibes at all.
last, it should be not just the lack of guarantees, but that if you did make it you probably run a handful of meets all year as your reward. i get it seems to be a thing among ambitious parents/kids to be the dumbest slowest kid in the school on the team at the most elite place, but that is precarious admissions and recruiting strategy. for sports i would want to be someplace i fit in the middle or top so i have security, coaching focus, and some success. the last walkon is an afterthought who might get a couple meets all year. you did your research, how many meets did the slowest kids get. i know kids seem to build this up into a rocky training montage but everyone else is training and competing hard, too.
there is usually a positive answer to these situations. if williams won't take your kid, pomona or swat would love to have them. so to speak. or the equivalent in whatever division or conference you can list. you're better off going to the one happy to have you and not begging the indifferent one to change its mind. you're happier now. you're less stressed when you show up. you just do your thing.