i thought the metro advice strange too. Whilst on the subject...here is an extract from LP
The efficient Tbilisi metro operates from 6am to midnight, and the two lines reach most important parts of the city, meeting at Sadguris Moed ani station. To use the metro, buy a Metromoney card (2 GEL), and charge it up with credit for rides, at any metro station ticket office. You touch the card on a reader when you enter the metro. Your first ride of the day costs 0.50 GEL, your second 0.30 GEL, and any further rides the same day 0.20 GEL. You can sell your card back within a month if you show the original purchase receipt. English signage and announcements are being phased in alongside Georgian. Station names are announced at each stop, and just before the
doors shut the next station is announced.