I was wondering if there is a rule/guide on if this info graphic person actually implies male/female - assuming it is used without the opposing specifically female human graphic
It doesn't matter whether 30%, 50% or 70% of users think this is male (vs female or gender-neutral). There is enough ambiguity here that the infographic will fail to communicate gender effectively so context and labeling are necessary to make it effective.
This Nielsen article describes why most iconic graphics need labels/context and why only few icons are universally enough understood to be used on their own.
Here are some examples which show how the gender of the graphic can vary dramatically depending on context and labeling:
While there is nothing that specifically makes this icon of a person male or female, there is a tendency in our current culture to assume a "generic" image of a person is male unless it has various markers to mark it as specifically female.
To play off the other person's answer where they gave several answers that implied the image could represent "both genders" or "gender neutral", they did not give an answer that represented the image being shown as explicitly female. (and even in the graphic that DOES reference "both genders", the image is still overwhelmingly a male image by percentages!)
Unfortunately, because of the massive affordance we have culturally built into this icon, it is unlikely that you will be able to make this image portray anything other than "male".
If you want to build a graphic that is designed to avoid the question of gender entirely, there are other images that avoid this issue neatly, such as non-human representations -- for example, Twitter's egg icons make no assumption of gender. I would recommend using icons like those where possible.
Gender neutral icons are a unaddressed issue within modern design patterns. The iconization of digital interfaces has occurred out of screen real estate with insufficient thought applied to user/cultural interpretation.
There is some good work going on at the noun project to address this. https://thenounproject.com/term/gender-neutral/132954/
Notice specifically the icon most similar to the one in the question, but with wider hips and narrower shoulders. This to me reads gender neutral without label or context.
We need to consider the context in this case: If this infographic is used discuss the number of people who hate their internet service provider, then the info-graphic does not need to have an visual indication of the gender. I think this graphic without any context would be termed UNISEX.
If a subject like bathrooms, Breast/Prostate cancer or any other comparison consist this graphic then it will the opposite gender human graphic. Otherwise it is safe to believe that without a context this could pass as UNISEX.