Hmmm. I would have thought that, if it were going to be used 'outdoors', most people would realise and expect that it could end up soaking wet or, in the cold conditions cited, covered in snow and/or ice, and thereby potentially 'slippery'
Indeed so, as seems so often to be the case. However, my fear is that all this "protecting the backsides" of manufacturers/suppliers may well create complacency and, by virtue of the "crying wolf" phenomenon, result in people not taking seriously the warnings/recalls that really mattered.
A year or two ago I had an argument with technical folk at Argos about a highchair that my daughter had which they were trying to persuade her had to be returned for 'replacement' because of a 'recall'. The manufacturer had apparently decided that there was a risk of it "falling over sideways'. However, some tedious research on their website revealed that Argos was then offering about 40 highchairs of similar design, height and weight, but that the 'recalled' one had the widest (side-to-side) base of them all, hence probably the least likely to 'fall over sideways'!
What annoyed me was that they were proposing to replace the 'recalled' chair with a similar one that had an appreciably narrower base and hence, to mind mind, more 'dangerous' in terms of risk of 'falling over sideways'.
Kind Regards, John