Stop spreading bs.
This is not bullshit, as some others users already mentioning, Doesn't matter if you mark it with or without RBF, the transaction always can be repleaced and that only depends of Node configuracions to accept it or reject it.
The only safest way to move the founds is ask to a miner if they mined your transaction without broadcast it (previously to the block begin mined), also it is even better if you are a miner and you include the transaction without broadcast it before it is mined.
Not for any address, that is only for low puzzles like 66, 67... maybe up to 80 bit can be solved in some seconds or minutes depending of the program used.
This is only for the next specific addreses:
67 1BY8GQbnueYofwSuFAT3USAhGjPrkxDdW9
68 1MVDYgVaSN6iKKEsbzRUAYFrYJadLYZvvZ
69 19vkiEajfhuZ8bs8Zu2jgmC6oqZbWqhxhG
71 1PWo3JeB9jrGwfHDNpdGK54CRas7fsVzXU
72 1JTK7s9YVYywfm5XUH7RNhHJH1LshCaRFR
73 12VVRNPi4SJqUTsp6FmqDqY5sGosDtysn4
74 1FWGcVDK3JGzCC3WtkYetULPszMaK2Jksv
76 1DJh2eHFYQfACPmrvpyWc8MSTYKh7w9eRF
77 1Bxk4CQdqL9p22JEtDfdXMsng1XacifUtE
78 15qF6X51huDjqTmF9BJgxXdt1xcj46Jmhb
79 1ARk8HWJMn8js8tQmGUJeQHjSE7KRkn2t8
Other Regular wallets are safe