Please be assured this is not the case.
1: The final UAI and total intake has not yet been finalised, though being the first year this option is offered the intake will not be large.
2: USyd is not restricting the number of places in any attempt to make the UAI exceptionally high. There...
Full general details online at All you need to know about enrolment - START - The University of Sydney
Specific details on what and how many units of study you choose naturally depends on your degree
Re: how does the timetable work?
Handbooks Online - Faculty handbooks - The University of Sydney
https://ssa.usyd.edu.au/ssa/handbook/uossearch.jsp
are good places to start
How do I get there? - START - The University of Sydney
There is a free bus to Sydney Uni from Railway Square - 2 mins walk from where your train will let you off at Central
See both
Flexible Entry Scheme for Engineering and Information Technologies - Home - The University of Sydney
Flexible entry - START - The University of Sydney
"Flexible Entry v Bonus Points
What's the difference between Flexible Entry and Bonus Points? And what does it mean to you...