To the best of my knowledge, the last time SoE T-shirts were given out as ‘PLEX For Good’ rewards was back in 2015…
After that the next ‘PLEX For Good’ Apparel reward was in 2020 for the SoE Face Masks.. Those took over 9 months after the charity event ended to get delivered, I know because I posted a forum thread about it which helped to get them delivered…
The ‘Reserve Frontier Safeguard’ (RFS) T-shirts were also rewarded for donations in 2020…
I don’t remember any other ‘PLEX For Good’ charity event happening after that which offered Apparel rewards for donations…
Anyway, these new SoE T-shirts are already in the Database and the limited time special offer ending date for them has already passed… There’s no reason for them not to be delivered, especially when brand new Apparel items included in limited time special offer game packs are automatically released in the redeem queue immediately after purchase…