Jay Simon has been cast as the voice of "Gorrox / Versix" in Power Rangers Super Ninja Steel - https://gcm.co.nz/artists/jay-simon

Jeremy Birchall has been cast as the voice of "Megamauler" - http://jeremybirchall.com/Voice/voice.html

Sarah Hart as been cast as the voice of "Snow Fight" - https://www.aucklandactors.co.nz/act...ils/sarah-hart

Ashton Brown cast as the voice of "Voltipede" - https://www.aucklandactors.co.nz/act...s/ashton-brown

So the production is still going on schedule?

If I'm understanding your question correctly: Regarding Super Ninja Steel, at this moment, there wouldn't be anything that would change the show considering it wrapped principal production back in May. Learning voice acting roles later on for the second half of the show way later is normal.

Jeremy Birchall is back with a second voice this season. He's also voicing "Shelldax" (also recorded back in February) - http://jeremybirchall.com/page8/page8.html

Ninja Steel Complete Season 3-DVD set coming August 14th:

That's a pretty nice box

the show being accessible
 

The reason why characters explain what is happening on the screen is because they are trying to make the show accessible to the blind.