Anti-lag IS used in drag racing, and can be used with a 2step. It is just setup differently than rally racing.
Most aftermarket ECUs that have anti-lag, like Motec and AEM, use a retarding of the timing to go to a rich condition and introduce unburnt fuel into the exhaust housing of the turbo. You have to go pretty far past TDC to do this (usually I start around 40 degrees). This is the way they do anti-lag for drag racing.
Rally sometimes uses a different way of getting gas into the exhaust manifold - but the effect is basically the same. Some systems have separate injectors that shoot fuel directly into the turbo manifold.
Anytime you have fuel being burnt inside the turbo, that build heat and puts stress on parts.