Is postdoc experience valued by industry?
There certainly is no "correct" answer to this question, as it depends on two factors: (1) the company (some will see it as useful, most probably won't), and (2) the type of postdoc (with or without management tasks? project lead? PI on a small project? independent or highly dependent of a professor?).

However, at least here in Switzerland and for Computer Science, the rule of thumb is that as soon as you are 100% that you won't stay in academia, every further month spent as a postdoc is inefficient in terms of career development. Yes, some companies may count your years as postdoc as some sort of relevant leadership experience, but most won't, and even those that do will consider a similar candidate with the same number of years working in industry to be much more attractive.

There is also another angle to look at this - you are currently looking to move into industry, and you have differing opinions from people that are already working in industry and people that are not. In absence of any other information, you should probably give more weight to the information provided by the insiders.