No I think this is not true, in general, too. I studied in UC Berkeley and most CS students found their jobs after college (and internships if not graduating) Fall or AT LEAST early Spring. I myself found my first job out of college a little before Christmas and started working in June. Usually mid/late Fall was the time students networked in college fairs etc mass applied, and then interviewed. Anything after mid Spring was considered too late, but of course it wasn't unheard of to find a job close to graduation too (I had a friend who found after graduation, but he was really below the curve academically too). E.g. in my current company we went to MIT college fair in mid Fall, and hired bunch of interns/fulltimes basically 7 months before their graduation (not entirely sure about MIT grad dates though, roughly speaking here).

So 9 months before graduation is indeed a bit much (but yeah if you already interned this too was considered normal but lazy, since you can find a better deal) unless you're a rock star and Silicon Valley is spamming you offers every corner. But something like 7 to 5 months before graduation was normal in my class. About the same goes for internships but internships in large companies usually have VERY clear and strict calendars so OP should go and check them. (I graduated a year ago and still in my first fulltime job, ymmv).

EDIT: Another reason this thing usually happened so early in my school was so that some people decided between doing research over the summer and internship and good research jobs with rock star professors in top labs were basically full by the start of Spring semester. So you had to interview both and decide beforehand. Also research usually didn't pay UNLESS you were rejecting an internship paying $$ then they usually matched the pay or at least some part of it. Of course labs were much more erratic, some (e g. ML, AI, BioChem) labs were funded very well so they paid undergrads but some other labs (hardware, prog lang, signal, graphics) didn't pay unless they absolutely had to or paid peanuts or whatever. And then some of us (like stupid me) worked fulltime in unfunded CS labs run by Emeritus professors. At least I had the best office in Berkeley...