Events aren't disconnecting in same scope?

I have a table function new which creates a table.

local stunned = {pool = {}}
stunned.new = function(player, target)
    local self = {}

When new is called upon, it assigns these variables in the same scope as the code shown above:

local walkspeed_connector = humanoid:GetPropertyChangedSignal("WalkSpeed"):Connect(function()
    self.old.WalkSpeed = humanoid.WalkSpeed

    humanoid.WalkSpeed = 0
end)    
local jumppower_connector = humanoid:GetPropertyChangedSignal("JumpPower"):Connect(function()
    self.old.JumpPower = humanoid.JumpPower

    humanoid.JumpPower = 0
end)

In the same scope, a function is created inside the table named remove. This is suppose to clean up by disconnect those signals and set the table to nil.

function self:remove()
    walkspeed_connector:Disconnect()
    jumppower_connector:Disconnect()

    humanoid.WalkSpeed = self.old.WalkSpeed
    humanoid.JumpPower = self.old.JumpPower

    self = nil
end

However, when function remove is called, those events are never disconnected. The two events STILL fire against my will. walkspeed_connector and jumppower_connector are in the same scope of the new function. Am I doing something very wrong? I could really use some help. Thank you! Here is the full code:

local stunned = {pool = {}}
stunned.new = function(player, target)
    local self = {}

    local humanoid = target:FindFirstChildOfClass("Humanoid")
    if not(humanoid) then
        return
    end

    self.old = {
        WalkSpeed = humanoid.WalkSpeed,
        JumpPower = humanoid.JumpPower
    }

    self.player = player
    self.target = target

    humanoid.WalkSpeed = 0
    humanoid.JumpPower = 0

    local walkspeed_listener = humanoid:GetPropertyChangedSignal("WalkSpeed"):Connect(function()
        self.old.WalkSpeed = humanoid.WalkSpeed

        print("WalkSpeed", self.old.WalkSpeed)

        humanoid.WalkSpeed = 0
    end)
    local jumppower_listener = humanoid:GetPropertyChangedSignal("JumpPower"):Connect(function()
        self.old.JumpPower = humanoid.JumpPower

        print("JumpPower", self.old.WalkSpeed)

        humanoid.JumpPower = 0
    end)
    function self:remove()
        walkspeed_listener:Disconnect()
        jumppower_listener:Disconnect()

        humanoid.WalkSpeed = self.old.WalkSpeed
        humanoid.JumpPower = self.old.JumpPower

        self = nil
    end

    stunned.pool[#stunned.pool + 1] = self

    return self
end