First, when taking omega 3 supplements, you generally care about increasing the ratio of omega 3 to omega 6. Hemp hearts have much more omega 6 than omega 3, so they're not very effective for improving the ratio.
Second, hemp hearts contain ALA, while what you generally want to improve is EPA and DHA (this is also covered in TFA). The body can convert ALA to EPA and DHA, but it's not efficient.
So all in all, if Omega 3 for the article's stated benefits is what you want, this is not the way. I recommend looking into eating more fish, or if you want a vegan route, algae-based supplements. [0] is a decent source from the NIH about foods and their Omega 3 content, split by ALA/EPA/DHA.
[0]: https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthPro...