The k’deira blech is a different issue than the gum. The gum is a well-known kula which your rav (or his, for that matter) may or may not like. The blech could be simple ignorance. The k’deira blech was touted as a new thing to make various things muttar on shabbos but advertisements aren’t halacha teshuvos and people make mistakes. I’ve seen more than one older gentleman take an umbrella to shul on shabbos because he held with the local eruv.
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