A few thoughts:-
He refers to "large tubes" in the beginning, without qualifying what that means.
Is he referring to "large" tubes as may be used in Audio work,such as the KT66, EL34, 6L6,etc, RF things like 6146s, 807s, or reasonably big directly heated RF stuff like the 4-250, or even larger, like 3J/261E, or 6166.
The last three, & many other types in this class were quite commonly used without any elaborate means of limiting "inrush current".
Due to the massive size of the filaments, this momentary high current does not cause any such "flash"--they just go from off,through dullish red to a bright glow.(not so easy to see with 6166s,except for the few ones with glass instead of ceramic.
To extrapolate what appears to be a faulty batch of tubes to smaller Receiving tubes in general, seems to be drawing rather a long bow, in my opinion.
Over many years I have noticed "heater flash",most commonly with 12AT7s (in which it seemed to be almost universal), & with other similar tubes.
Such tubes had life spans indistinguishable from other types which didn't do this.
Looking at the current spike on the 'scope display it is easy to say EEK!
at its amplitude, but it is of very short duration, which limits any adverse effects.
Properly made tubes from reputable manufacturers had "heater flash" & still turned in extremely long life spans.
The problem now, is like many other components----- the "provenance" of the device may well not be accurately known.
"Philips" or "Mullard",or whatever,unless on NOS tubes means nothing, as those once great names have been "whored off" to the highest bidder.
Even back in the old days, some tube brands met spec or better more easily than others.
Our old Marconi TV transmitters used a lot of Receiving type tubes as well as the big stuff, & we found that the best tubes ( in order of preference) were:
AWV Radiotrons from Australia
RCA " (USA)
Seimens ( Germany)
EEV (UK)---Yes, Virginia, there was another EEV!!
Marconi (UK)
Sylvania (USA)
Philips (Aust or Holland)
Mullard (UK)
Also rans were:-
Brimar (UK)
Zaerix (UK brand--- pretty dire,God knows where they were from).
Towards the end, many companies stopped producing tubes & bought "crud" from wherever they could get them.
I fear that these days, many tubes are recartonned "pulls" which have already had their life, & factory rejects.