I could surely be wrong, but I think that's a mistake on the tech person's part. Now the standard media may be some form of synthetic blend already ..but anything Wix publishes as "Glass Enhanced" typically carries a premium in cost.
This is just the first example that I could find.
Part Number: 57620
UPC Number: 765809576209
Principal Application: Dodge Pickups w/ 5.9L Cummins Diesel, "B" Series Eng. (03-07) (Fluted Version Of 51607) (High Efficiency Fluted Version is 57620XE)
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 6.945
Outer Diameter Top: 3.681
Outer Diameter Bottom: Closed
Thread Size: 1-16
By-Pass Valve Setting-PSI: None
Beta Ratio: 2/20=20/30
Max Flow Rate: 12-15 GPM
Nominal Micron Rating: 20
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.835 2.461 0.170
Part Number: 57620XE
UPC Number: 765809526204
Principal Application: Extra Efficiency Version Of 57620 - Has Fluted Can (can use in place of 51607)
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper/Glass
Height: 7.000
Outer Diameter Top: 3.690
Outer Diameter Bottom: Closed
Thread Size: 1-16
By-Pass Valve Setting-PSI: None
Beta Ratio: 2/20=14/25
Burst Pressure-PSI: 378
Max Flow Rate: 12-15 GPM
Nominal Micron Rating: 14
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.830 2.440 0.225