INFORMATION_SCHEMA.VIEW_TABLE_USAGE only shows tables from the same catalog
Yes, stop using INFORMATION_SCHEMA for various reasons, including one I didn't mention in that post (yet), which is the fact that they don't handle cross-database dependencies.

Use the catalog views and dynamic management functions instead.

To get just the views, you can use sys.sql_expression_dependencies:

SELECT 
  [schema] = s.name, 
  [view]   = v.name, 
  d.referenced_database_name, 
  d.referenced_schema_name,
  d.referenced_entity_name
FROM sys.views AS v
INNER JOIN sys.schemas AS s
ON v.[schema_id] = s.[schema_id]
INNER JOIN sys.sql_expression_dependencies AS d
ON v.[object_id] = d.referencing_id
WHERE d.referenced_database_name IS NOT NULL;


To get the column names too, you can use sys.dm_sql_referenced_entities:

SELECT 
  [schema] = s.name, 
  [view]   = v.name, 
  r.referenced_database_name,
  r.referenced_schema_name,
  r.referenced_entity_name,
  [column] = r.referenced_minor_name
FROM sys.views AS v
INNER JOIN sys.schemas AS s
ON v.[schema_id] = s.[schema_id]
CROSS APPLY sys.dm_sql_referenced_entities
(
   QUOTENAME(s.name) + N'.' + QUOTENAME(v.name), N'OBJECT'
) AS r
WHERE r.referenced_database_name IS NOT NULL
AND r.referenced_minor_name IS NOT NULL;