I was curious too - a little google search came up with this article written by Sean Martin in April 2017 - https://www.express.co.uk/news/science/794152/black-holes-white-holes-multiverse-big-bang-theory - which this post quotes (or better said plagiarizes) word by word, including the title (Forget black holes, WHITE HOLES are weirder and 'SPEWING matter from another universe'), without even citing the source...
I personally don't give much credit to anything I read in the Express, but you decide... I don't have time at the moment to dig deeper into it but certainly is an appealing concept, legit or not.