So far I think I'm still seeing one of them in my peers list for my public-ish NTP server:

         remote           refid      st t when poll reach   delay   offset  jitter
    ==============================================================================
    +time-e-b.nist.g .NIST.           1 u  372 1024  377  125.260    1.314   0.280

...and maybe it's gone:

    #time-e-b.nist.g .NIST.           1 u 1071 1024  377  125.260    1.314   0.280