Run from the adjacent room and jump at the end of the platform. From the top right platform, jump to the left and wall jump just above the spikes and climb the left wall.

Entrance condition:

{
  "comeInRunning": {
    "speedBooster": true,
    "minTiles": 5
  }
}

Requires:

"canCarefulJump"
"canConsecutiveWalljump"
{
  "not": "f_DefeatedPhantoon"
}

Dev note: Because this requires canCarefulJump, there is no canRiskPermanentLossOfAccess as there is a path across with or without f_DefeatedPhantoon. This variant of the strat includes an extra couple of tiles of runway for lenience.