Wikipedia has consistent style rules around usage/conversion of currencies[1][2], so yes your edit would probably be swiftly reverted if it didn't follow those.
I'm not really sure why you're using such a conspiratorial tone.
[1] https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Date...
[2] (From above page) "For obsolete currencies, provide an equivalent (formatted as a conversion) if possible, in the modern replacement currency (e.g. decimal pounds for historical pre-decimal pounds-and-shillings), or a US-dollar equivalent where there is no modern equivalent."
The Pound of today is pretty much a different currency to the 19th century
Utter horseshite, that's like saying a Canadian along the border would be clueless as to CAD-USD conversion rates. The UK is our next door neighbour. It's common enough to buy goods up north, online from the UK, and to travel there. We can generally do a rough conversion in our heads; the same goes for USD nowadays due to the prevalence of online shopping (and the fact that its now at near parity with EUR helps).
> The Pound of today is pretty much a different currency to the 19th century
True of any currency. You may as well argue that any measurement in an inflation adjusted currency is nonsense if you're going to go down that route.
Given that the Sterling was in use then and now, I'd argue that the most meaningful way to calculate value would be to adjust the value for the inflation of Pounds Sterling. That can then be converted as appropriate to euros for convenience (as it seems to have been in the first paragraph of this article).
That would make sure nobody alive would understand it.
I for one can't be bothered to read the sources and will just take in the factoid as-is and move on.