Predictable result of the (actually) racist stuff that's being promoted and apparently isn't a problem anymore. This will get worse before it gets better.
This claim sounds dubious to me. There absolutely must be examples of this, but it's a stretch to turn it into a generalization for all magnet schools. It may be the case for a "No. 1" school such as TJ, but as someone who attended two magnet schools, the process has always been unsurprisingly fair.
This is an extraordinary claim, and you have provided no evidence. Some magnet schools (e.g. Lowell in San Francisco) used to have purely merit-based admissions (you must exceed X on a test). Do you think this has 'nothing to do with student intelligence or ability'?