You really should put a note or reword the article as the way you describe it, Surfshark offers WireGuard on Linux. Based on your wording I purchased Surfshark, and now have a VPN that can't use WireGuard on Linux.
One of many VPN providers on the planet, Surfshark, has become the latest in a long line of virtual private network providers to adopt the swift and concisely-written WireGuard protocol. However, I wasn't satisfied when I used it because it provided dirty VPNs many times. I changed it with ExpressVpn. It is convenient for me and I like to use it. If you take an annual subscription, it will cost $8.32. If you are interested in it, you can read a review on site with just a click here you will find all the information about it.