The video does not show Touchdown prior to "attempting" to deploy TRs. What it shows is the Jacket migrated aft an inch, then stopped. The attempt was prior to the open/jam, by how much is on the DFDR. If the untilt had not completed, or the switch was operating in normal sequence, the manual application could well have been prior to T/D. IMO. Without spoilers, and good braking, it was a dice roll anyway. T/Rs are not crucial, as explained, but the lack of T/R deployment in timely fashion does suggest some thing was amiss with the plan. It is not accurate to state conclusively, but if the TR system was this late, and occupied our crew elsewhere........not a good runway to get behind the a/c.