Wrong page.
On the 744, the N1 has to be at or near idle, as well as the main gear untilted, before the reverser locks unlock. Having the engines spooled up at touchdown actually delays reverser deployment.
On a nominal approach, the throttles can be brought to idle at 50', and the flare (minimal as it is) done at 30' to attain a smooth landing in the first 1000' of runway. The nose is brought down as the reversers deploy, and max reverse (if used) applied when available.