Good find but it's still pretty inconclusive. An alternative reading of it is that Bourdais was holding as tight a line as he physically could do, and that Massa closed in a fraction too much and caught his front wheel. Surely Massa should have made more effort to hold a wider line, given that there was a car inside of him. Also, Bourdais may not have been in the middle of the track, his car was dragged out wide by Massa's contact with him which is why he appears to be some distance from the inside kerb. I guess we'll never know for certain though!