Not a plant I know from personal experience but compare with Baccharis halimifolia.

" in spite of showing the most common, everyday symptom of lack of nitrogen: general yellowing. " And this may be where some of the confusion is coming in. A nitrogen deficiency is NOT characterized by a "general yellowing".....at least in an established or older plant (may show as a generalized off color in seedlings). It is the oldest (lower or inner) growth that first shows symptoms of yellowed foliage, never the new growth. That's where the plant pushes all of its nutrient reserves. If this were the issue with the plant in question - lack of adequate N - then we would see internal discoloration, not the external coloring the photos illustrate. And the new growth would not be as lush or profuse or as dense as is shown. And that is simply the way that specific nutrient deficiency works....it is not really up for debate! Yard, I am really having trouble understanding why you are not willing to accept this, including the input from two quite experienced horticulturists/plantspersons (floral and Embothrium), leaving my comments aside. It's not like yews of all types are rare commodities in either the PNW or the UK and both individuals confirm that very chartreuse, acid yellow/lime green is not an uncommon coloring for any new growth yet you seem to dismiss that as inconsequential or limited to only selected cultivars. I wish I had taken photos of the new stock at my local nursery when I was there last week, as ALL the yews were showing similarly colored new growth. It only lasts a matter of a couple of weeks before it takes on the more typical darker green color. And there is also the very real consideration that color perception is largely subjective - what seems anemic or bleached out to you looks perfectly normal to others - and that photos seldom portray color with total accuracy. I have to say that I do not see any "yellow" in the OP's photo.....just a very vibrant lime green. And the shrub appears to be extremely healthy with dense new growth and no obvious need for any fertilization at this time.

These don't come back from bare wood. If you cut back into the dead looking interior then you are left looking at dead - all you can do with the one shown now is remove it.

Nandina domestica, aka heavenly bamboo.