Yes, that policy is still in effect. You just need to sign the form and keep it with your tax return records.
According to the instructions after page 1 of Form PA-8453:
Any taxpayer filing electronically from a home computer must keep the signed Form PA-8453 and supporting documents for three years after the due date of the return or the date the return was filed electronically, which-ever is later. Taxpayers must make the documents available to the PA Department of Revenue upon request. Do not mail Form PA-8453 and attachments to the PA Department of Revenue unless requested.
