It isn’t an approved technique because it invalidates the landing performance calculation (although that particular runway is long) plus it significantly increases the risk of a tail strike as elevator authority decreases. Tyres on tarmac with the lift dumped (spoilers and low aoa) produce an order of magnitude more braking force than aerodynamic braking. It can help on a slippery grass runway but not on tarmac.
Why anyone would do it is beyond me, especially when LIFO+ includes MOP and disciplinaries.