People are probably a bit confused to see constant references to full storage tanks, and then data from the Energy Information refers to U.S. crude storage capacity utilization being less than 60% while on a global level, the IEA puts it at 63%.
I think the data is not available to the public, atleast not for free. Check this out this link.
Single user licence: €6 150
Multi-user licence 2-5 users: €12 300
Multi-user licence 6-10 users: €18 500
Multi-user licence > 10 users: €24 600
Global Licence: €61 500
Also the data chart in the IEA website to which you have provided the link, there is data only upto 2017 (some other data has details for upto 2018).
You can check out the weekly US storage capacity through this link. It's available for free.
The guy who wrote the article might have access to the full data provided by IEA.
Also here is something else I found at this link
The IEA estimates that global land crude storage capacity is around 6.7bn barrels and had a utilization rate of around 63% at the end of January.