angle 1: he has a policy of giving anyone displaying interest with solid but insufficient times a one-day/one-week/trial-length kick of the tires. you will then almost without fail get cut. this will likely be evident looking at times on TFRRS. if their times strongly suggest you don't belong, then you won't really have a chance. "i don't have room." he was blunt with you but he allows a little tryout.
angle 2: you ask about joining TF and give TF times, your times aren't up to his TF muster -- explanation above -- but he is curious if you are good enough to run XC. the coaches are often the same person. XC often has more room for distance runners. if so, your tryout will just happen to be this july or august -- when XC is starting. if you are getting a pity TF trial, that will more likely be in november, closer to that season. to me if someone says there is no room TF but come out for a workout, maybe it's a XC tryout. cause based on your times and what he said, you're not TF stuff to him. but maybe he's like, i could use some XC, and maybe after a season of training, you flower and he's like, dude, i want to see his track times now.
i mean, did he ask about XC? have you run it?
but a november trial, to me, would be more of a blowoff. you get a TF tryout, but there's no room.
angle 3: he has you in for the one-off workout then tells you to work out on your own and see what happens. you work out on your own, you get another one-off tryout next year. if you can improve, he gives you a longer look. if not, well, we tried.
i agree with the comment about showing up ready to rock, peak shape. if you have any chance, it's impressing him then and there. you may have zero chance as he even said. you won't know that til you show up. so you have to show up prepared to compete for a D1.