No, it just means that within the population they studied, the variation in whether individuals identified as gay could be explained more with environmental fac

No, it just means that within the population they studied, the variation in whether individuals identified as gay could be explained more with environmental factors than genetic ones. It doesn't say that being gay is 25% genetic and 75% environmental, that's a huge misconception. If parents all treated their kids the same way, and they all had the same treatment in schools, etc, then you'd probably see more influence of genetics than environment. That's how heritability works, it's relative to the population and how homogeneous it is.