It seems that Metro Redux rumors for Switch have been slightly reinforced by a recent listing for the game. According to Doctre81, Metro Redux for Switch was listed by the same retailer who leaked The Witcher 3 for Switch via a similar listing. In addition, Wccftech covered this rumor when it surfaced in October, citing a possible December release according to the listing. Its very important to clarify that this is a rumor so take it with a grain of salt. However, be on the lookout for any Metro related announcements in the near future.
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*Update* Metro Redux has been rated for Switch by PEGI.