This is what I think the research based on surveying men is missing: they are not defining what loneliness is and men are lumping being single and/or celibate into the definition.
Men have long been socialized to measure their value by how much contact they have with an intimate romantic/sexual partner than the conversation and non-sexual activities that make up the majority of all of our lives.
Thankfully, as we continue to have these conversations, men are learning that the mental and social well-being of women has long been established by our friendships and our affiliations with organizations and social circles, they are starting to learn how to better address their social needs and valuing themselves and others more.
Yea I know we have some dogheaded ones out there. Obviously that's one reason we ended up with President Dumpster Fire.