It would be fallacious to assume that, at a given temperature, a lager yeast will be cleaner than an ale yeast. In fact, a lager yeast may produce MORE esters than an ale yeast if fermented at 15 or 16C. Lager yeast have a very clean profile only when fermented at the recommended temperatures.
Yes. But 15C is within the recommended range for most dry lager yeasts. Yes at the top end, but within the recommended range.
Yes, 9-12 is ideal but I included 15 as it is a temp that is often achievable in winter in many cases without temperature control.
At no stage did I assume that a lager yeast would be cleaner than an ale yeast for a given temperature, which is why I have specifically lager temperatures in my post.
I'm pretty familiar with the difference in ester production between lager and ale yeasts, and the subsequent effect on beer and requirements for diacetyl rests and/or lagering, which is what drove my advice for the OP.