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According to the processors datasheet, https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/7th-gen-core-family-mobile-h-processor-lines-dat… , Intel® Boot Guard is supported for this family of processors. Just like you mentioned the same document does not indicate in which SKU's the feature varies, so let me double check that.
I will update the thread as soon as possible.
I work for Intel Customer Support and I have confirmation that the Intel® Core™ i7-7700HQ Processor does support Boot Guard.