Yeah the only thing you can say is he's over achieving his expected goals - 'running hot' - a bit more than is sustainable so you wouldn't expect him to hit quite the number of goals he's hit this season
but his shot numbers are pretty monstrous - basically the same as Aguero's - so he's going to score a lot of goals for as long as he plays in this team
Whilst I agree, I would also point out that his shots are steadily increasing, just as Kane's have been year on year. Which means that even if he dips into a more human conversation rate, you would hope that an increasing shot volume as he adapts to the goalscorer role rather than play maker one sees his goal output stay pretty high.
Unlike say Josh King who some on here were clamouring for us to sign in the summer. I pointed out at the time his shot numbers have always been low, were still low last season but just had an outrageous conversation rate outscoring xG a lot. There was nothing to suggest it would be sustainable and low and behold he is back to being at best a 1 in 6 goalscorer rather than 1 in 2 last season. Andre Gray is another example from the summer of a player you could predict would struggle.
So yes, based on Salah's current shot numbers I suspect he won't score as many next season. However, if you use his projected shot numbers, who knows.