If the manufacturer that fabricated that termination designed it for indoors and outdoors use they likely would not call it an indoor termination. They would call it just a termination. So either somebody mislabeled that termination an indoor only termination or you should not use it outdoors.
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"Don't disturb my circles." translation of Archimedes last words
What does the manufacturer have to say on the topic? Instruction leaflets? Website? Telephone?
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