Saying everyone is 'still safe with some -O* code massage' is a very strong assumption. In fact the paper in question deals with the issue. Taken from section

Saying everyone is 'still safe with some -O* code massage' is a very strong assumption. In fact the paper in question deals with the issue. Taken from section VI. A. " Compiler Optimization: Programmers of optimized executable binaries can be de-anonymized.": "[...] programming style is preserved to a great extent even in the most aggressive level-3 optimization. This shows that programmers of optimized executable binaries can be de-anonymized and optimization is not a highly effective code anonymization method." Please try and do a basic level of investigation before making claims.