When people someone special talks they get special tag?

local chatFrame = script.Parent.Frame
plr = game.Players.LocalPlayer
-- Bind function to update from server
game.ReplicatedStorage.SendMessages.OnClientEvent:connect(function(messages)
    -- Clear all of the current messages
    chatFrame:ClearAllChildren()    

    -- Create TextLabel for every message
    for i, message in pairs(messages) do
        if plr.Name == "docrobloxman52" then
        local newLine = Instance.new("TextLabel", chatFrame)
        newLine.Text = "[DEV] "..message    
        newLine.TextColor = BrickColor.new(255,0,0)
        newLine.Size = UDim2.new(1,0,0,18)
        newLine.Position = UDim2.new(0,0,0,18*(i-1))
        newLine.TextXAlignment = Enum.TextXAlignment.Left
        newLine.TextYAlignment = Enum.TextYAlignment.Center
        newLine.BackgroundTransparency = 1
        newLine.BorderSizePixel = 0
        newLine.TextStrokeTransparency = 0.5
        newLine.FontSize = Enum.FontSize.Size18
        newLine.Font = Enum.Font.SourceSansBold
        elseif plr.Name ~= "docrobloxman52" then
        local newLine = Instance.new("TextLabel", chatFrame)
        newLine.Text = message  
        newLine.TextColor = BrickColor.new(255,255,255)
        newLine.Size = UDim2.new(1,0,0,18)
        newLine.Position = UDim2.new(0,0,0,18*(i-1))
        newLine.TextXAlignment = Enum.TextXAlignment.Left
        newLine.TextYAlignment = Enum.TextYAlignment.Center
        newLine.BackgroundTransparency = 1
        newLine.TextStrokeTransparency = 0.5
        newLine.BorderSizePixel = 0
        newLine.FontSize = Enum.FontSize.Size18
        newLine.Font = Enum.Font.SourceSansBold
        end
    end
end)

This is my script and when I tried it out, everyone that spoke had [DEV] next to their name. This is a problem. Can you help? Also it is in a local script