Issue with using BinaryEncoding.Type to create a MonthEnd Date table

Hi 

I am recreating a Power BI dashboard. I came across a MonthEnd table table that was created using the query below:

 = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjbQNzDRNzIwMlGKjQUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t])

Could someone please help me read the query or show me how to create the table?

Thank you in advance.