I honestly think they only really need to give airtime to the following older shows:
Power Puff Girls
Cow & Chicken (maybe)
Edd, Edd, n Eddy
Billy & Mandy
Others like Regular Show and Adventure Time are more current and...
Philo is only showing the two showings on the 22nd and 23rd for me, so its unclear whether this is a one off thing (for maybe the start of spring for some reason) or is a regular part of the schedule now.
Nick is Nick. That includes P+, PlutoTV, Nicktoons, and TeenNick.
Now I do see TeenNick being shut down, and if it does it'll be sooner rather than later. I don't pretend to know the economics of PlutoTV but with how they've curtailed classic programming there too I don't really care.