Are you aware that that site is a well-known climate change denialist disinformation site?
Edit, to add: hence, there are no other sources.
No, no they're not. To the best of my knowledge.
EDIT: MORE DATA FROM NASA SHOWING 2019 IS NOT AN UNUSUAL YEAR: https://neptune.gsfc.nasa.gov/csb/index.php?section=234
We're on pace to beat the 2007 sea ice extent in the arctic and may even beat the 2009-2018 average depending on how fall and early winter go in the arctic.
Meanwhile, antarctic sea ice extent continues to hew close to average.
Are you aware that climate science is an incredibly young and immature field and that we still don't have a handle on all the factors that drive climate change?
https://journals.eco-vector.com/0205-9614/article/view/11444