he did invested through Fenbushi. Found it, Julian clarified that in a post in medium a while ago. The source of that news website are just FUDnews released just before ICO. Another failed attempt to cause FUD? what will come next? Gotta be creative this time.

"Why is Vitalik Buterin listed as an investor?
If you don’t know Vitalik Buterin in the blockchain world you must have not read any news about that industry — ever. Most people connect Vitalik to being the co-founder of Ethereum (www.ethereum.org ), few people know that he is also an avid investor through his fund Fenbushi, where he is a founding partner: www.fenbushi.vc We first met Vitalik around a year ago, when he moved to Singapore and both he and TenX used SGInnovate as a co-working space (www.sginnovate.com ). He also became one of our early card users and gave us invaluable feedback on COMIT (www.comit.network ). When TenX was doing the seed round investment in March 2017, we were introduced to his partner Bo Shen from Fenbushi. Fenbushi became the lead investor in this round and since both Bo and Vitalik are the fund’s main partners it was natural to list them on our website. The only ones who ever had a problem with that were the people watching from the outside and not Vitalik or Bo."

https://medium.com/tenx-wallet/reflecting-on-a-highly-successful-tenx-tokensale-b2705d593f1a