The laws define "alert" as
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A notification, whose form may be specified by the Regulating Authority, to the effect that opponents may be in need of an explanation.
That's all. There is no implication that players might, or should, infer some meaning to the call based on the alert. IMO it is folly to make such an inference. I know that's the practice in England (and probably other places). It's still folly. Let's keep it (sort of) simple: if a player alerts, and his opponent does not ask for an explanation, the opponent continues at his own risk. If a player does not alert, and it later turns out that [a] the call required an alert, [b] the opponents did not get an explanation of the call, and [c] they were consequently damaged, then they are entitled to redress. There should be no support for an argument that "he alerted, so I assumed it was X, and it turned out to be Y, so I should get redress".
Now if the alert regulation has a hole in it, such that some meanings which don't require an alert may be unexpected, well, I guess the only recourse a player has is to ask for an complete explanation of any auction in which such a call comes up. Maybe it's time consuming, and maybe it's a pain in the ass. And just maybe, if the RA hears enough complaints about the situation, they'll change the rules.