Does buying the epic version of the current xpac with game time bundled in count?
Going by the blue post on the TW WoW forums of this very same change, I’d guess it would, assuming you paid for the epic version of the expansion with $ rather than battle.net balance.
Blue post: translated by Edge:
(Updated on September 9)
Players who wish to exchange “Game Coins” for “Warcraft Tokens” must have purchased more than 29 days of playtime and have used them for more than 30 days. Players who purchase Warcraft tokens with cash are not affected by this regulation. The World of Warcraft production team will continue to monitor the in-game price and economic situation, and take necessary countermeasures. Thank you for your patience and support.Playtime products that will be counted include:
- Packs of expansions or upgrades that contain playtime (e.g. World of Warcraft: Rise of the Dragons Epic Pack, Northern Rift Epic Pack Upgrade)
- Standard Playtime items (30 days, 90 days, 180 days)
- Playtime Pack (180 Days with Mount Special Offer Pack, 365 Days Annual Pack)
Dear adventurers of Azeroth,
In order to provide a better gaming experience, we will temporarily remove the Warcraft token and make adjustments to the game mechanics. We will resume trading as soon as the adjustment is complete. We apologize for any inconvenience caused.
World of Warcraft team
[Emphasis mine.]
That sounds like it’s a simple game time flag rather than interpreting battle.net payment method history.
ie, grandfathers in older users.
Hmm… Could be a translation issue, or a lack of specificity on the TW Blue post, though the US one definitely specifies that you must have paid real $ for the game time to count.
(…I do hope it grandfathers in old users though… I’ve been playing this game since 2010 and stopped paying with $ the second the WoW token came out, which was back sometime in 2015, iirc – so I’d fall afoul of the new restriction. 
)
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It’s lacking clarity on how they interpret billing history, if at all, instead of some wow account time variable, hence this post.
What they wanted to implement versus what they could code in might be at odds.
Edit:
From what I can tell, the restriction stops NEW accounts entirely, as the taiwan post mentions days of play time must have been consumed, so gifting a fresh bnet won’t work.