LONDON — After drawing some criticism from online naysayers for putting Saint Laurent, a brand that has seen a continuous dip in sales, at the top of the hottest brands ranking for last year’s fourth quarter, Lyst on Wednesday unveiled an updated methodology tracking genuine brand heat that no longer solely focuses on search data collection on the platform. The recalibrated methodology, implemented for the first quarter with Chanel topping the chart, is now structured around three interconnected dimensions of data — desire, demand and discovery — that aims to offer a more comprehensive and culturally attuned measure of brand heat. Lyst said desire data measures the volume and intensity of cultural appetite for a fashion brand or product online.…