I'm not sure about the UEF Billy nuke changes as 2 of them can now kill any game ender regardless of shielding. All you'd have to do is teleport next to the game ender fire the first billy, it impacts the shields dealing 12k damage all of them, then the second one teles in a second later and billies again overmatching whats left of the shielding and dealing the full 12k damage to the game ender.
To counter this you'd have to have 4 tmds in range to shoot the billy down before it impacts the shielding which gives the tmds a second or two to react which I'm not sure is possible due to they're projectile speed? Aeon tmd cant stop this as the billy would have to touch the magic ball but there'd be a shield or 3 in the billies way. An unreliable counter would be units with aoe that kill the billy as its being launched so triads and oblivions might be viable. The only real counter I see is a bubble SACU that can just tank the 24k damage.
I'd love to be proven wrong as the tele billy opens up some interesting strategies but in its current form i think it might be too oppressive.