Niveums silver leaf, nutrient deficiency or?

[Stone]

For me 100 ppm N Akerne /MSU per week is to hight . Check your conductivity of your solution and you will be surprised.
Akerne recommand 65 ppm N per week and this is already to hight for this paphiopedilum family. 40 to 50 ppm N per week is enought. They are slow grower !.

We also have to keep in mind that bark needs about 30-50ppm N/week (from memory) just to feed the microbes braking down the bark. That is before the plant even sees much. I would suggest that 80-100ppm/week when in full growth is better. (in bark) If you are worried about salinity, you should use a formulation with higher N so the EC remains the same.
In other media with a different nitrogen draw-down the opposite might be true. Eg. In osmunda, no N is needed at all! In hydroponics there is zero N draw-down. It all depends....

 

[IvoPhal]

Thank you all for guidance.

 

[NYEric]

Are those mealybugs down in the growth with the bud? It sure looks like it but from your images I can not be sure.}
Dude!? You must live in the realm of Harsh! The doom is so strong in everything you see. I think the leaf yellowed because of the materials left near the center. By repotting you flushed the plant clean, should be OK.

 

[IvoPhal]

Or living in master Yoda planet, actually the home is pest free except family members….

 

[Tom-DE]

Or living in master Yoda planet, actually the home is pest free except family members….

That is a good one!

 

[Linus_Cello]

Or living in master Yoda planet, actually the home is pest free except family members….

Dagobah?

 

[IvoPhal]

Some update following your advices and smth for myself:
1. Cut the light even in winter it was shiny
2. Fertiliser peters . Professional 20 20 20 at 50- 60 ppm N weekly
3. Application of insecticide based on natural substances.
After flowering I’ll repot in smaller pots with mix orchiata and perlite - chunky …