It's racist because it discriminates against ethnic minorities. It is not blind to race.
You didn't read my link did you? It's not one year of test data.
'A detailed analysis of the first year’s entry patterns, pass rates and applicants’ family backgrounds was covered by the Guardian at the time. It showed that children from local state primary schools had been less successful than in previous years, while a higher proportion of privately educated pupils had passed.
With two more years of test data and further evidence from CEM released under the Freedom of Information Act, the group claims the evidence against the test is stronger than ever. It shows a continuing strong bias against children from the most deprived postcodes (measured by the government’s income deprivation affecting children – IDACI).'
And
'“Buckinghamshire is a particularly good area in which to analyse how the 11-plus test works in practice,” says Hickman. “Unlike other selective areas in England, all the children at Buckinghamshire state primary schools are entered into the 11-plus exam unless their parents opt out.
“So if the test was resistant to coaching we should by now be seeing substantial narrowing of results between children from different backgrounds. The fact that the evidence shows the reverse raises uncomfortable questions about why a test that consistently selects on the basis of prior opportunity and social background is still allowed.”
Rafiq Raja, Muslim Parents Association in High Wycombe
Rafiq Raja of the Muslim Parents Association: ‘The 11-plus is a legalised form of discrimination.’
CEM has quietly withdrawn its brochure claiming that the test, which is believed to be worth £1m a year to the university, can assess “natural” ability. And Prof Robert Coe, director of CEM, says his researchers are still looking at why certain groups are not doing well in the test.
“The concept of ability is very problematic and comes with a lot of other baggage. I wouldn’t use the term ‘natural ability’ and we did remove it from our online material,” he says. Whatever system you use it is imprecise, there are false positives and negatives and probably more of those than people realise.
I've bolded the bit at the end. Whatever test you use, kids will be put in the wrong school, and that affects more kids than you think.