Remind me, is table itself tainted when you insecurely add/replace key/value pair?

[rowaasr13]

I just noticed this familiar UI panel "click" every time I used AP item and since I was also working with Artifact API at the time, I immideately thought that someone is obviously scanning artifact on each update without disabling panel as they should. Search for SocketInventoryItem found that ExRT (Exorsus Raid Tools) was the culprit, but I also found following piece of code there:

do
    --Fix Blizzard Errors
    local def = C_ArtifactUI.GetTotalPurchasedRanks
    C_ArtifactUI.GetTotalPurchasedRanks = function(...)
        local arg1,arg2,arg3 = def(...)
        if not arg1 then
            return 0
        end
        return arg1,arg2,arg3
    end
end

So, as subject says, would that make any access to C_ArtifactUI itself tainted and bring all kind of funky errors in combat?