Loading front wheel in a sharp turn?
He is right.

1) in cycling, weight is distributed more on the rear wheel (70 rear-30front approx.). So even assume that both wheel is at the same leaning angle, the front would lose traction first (friction proportional to reaction force). This is because the front wheel has less 'grip' limit than the rear wheel.

2) When rider starts to corner/or correct the cornering, the two wheel are not exactly leaning at the same angle. The front wheel both leans and steers the bike (see Figure). In simplified model, you can think that the front wheel is the only component of your bicycle that 'correct' the centrifugal force for the turn. In order to correct the cornering, the front wheel needs to 1) counter-steer, to balance the leaning, and then 2) change the steering appropriately. The whole process means front wheel lose grip more easily (rear wheel change direction less than the front).

You can see the video from Criggie's answer that the front wheel lost grip, just after he tried to correct the 'leaning' and the 'cornering radius'.

3) front wheel also has less contact patch (due to load distribution again). This can be verified when you are on normal cycling position, the rear tyre usually being 'flattened' a little more.

Video:
                
            



Partial momentum: momentum that is being shared between the Front and Rear wheel (from rider and bike itself)

Rider momentum: when cornering, the bicycle generally yawns at an angle to the 'original' momentum (in order to turn). That is why we need to lean, in order to balance the 'original' momentum that causes torque in rolling direction.