Without clear evidence that TP discriminated against your wife as the result of her national origin or ethnicity, it is merely poor form to do so on FT. In your dealings with TP it is inadviseable in the extreme. If your claim is not sustained, then you will be properly ignored. Indeed, you yourself report the reason for the downgrade and that is TP following its own procedures (which are roughly the same across most carriers).

The bottom line is that pursuant to the contract your wife agreed to with TP, it may downgrade her and refund her 30% of the cost of her ticket for the segment downgraded. That is all she was entitled to. You are not entitled to anything (presumably you would have spoken with the cabin crew and arranged for her to sit in your J seat). Indeed TP went out of its way to rebook both of you, which is not required either by contract or EC 261/2004.

She is not entitled to a downgrade refund (it is not "compensation" but a refund) because she was not downgraded. She is not entitled to delay compensation because this was a voluntary reroute and because she was apparently ticketed onwards to YYZ. If she was not delayed at YYZ, her arrival into and departure from LHR are irrelevant. You are entitled to nothing as TP did not seek to downgrade you and did not involuntarily reroute you, nor were you delayed into YYZ.

Rather than complaining about what you believe your wife's ticket entitled her to, it is better to read the contract she agreed to before purchase and then understand that she got more than she was entitled to. You got a lot more.

Finally, consider that if, for whatever reason, the J "cabin" was overbooked and then oversold at the gate, some passenger was going to be downgraded. TP chose the passenger traveling on the award ticket, presumably to avoid exactly the sorts of allegations you have insinuated and because somebody has to have a priority and it was not the award ticket.