It's not harmless though.
It's inviting a major corruption opportunity of the data. One that is entirely avoidable.
In a life and death situation. With life and death implications.
Imagine if AGE had two questions.
Actual age.
And age you wish you were/age you believe you are mentally.
And the company invites everyone to complete age truthfully, and also encourages the collection of a false age too. Implying that factual age is probably not that important a data point.
And then, your first analysis released to the press says "21 year olds at higher risk than previously thought".
What does that mean? Will your audience instantly know that age no longer necessarily means age?
EVERY analysis will then have to be probed further. That's if people even realise that age no longer means what it always has because it's become acceptable to offer "age you want to be" in place of "age".
Real 21 year olds? Or imaginary ones? Are you sure your database hasn't accidentally pooled data from both fields together until it's irretrievably muddled? Does everyone at the company know that "21 year old" can mean two things: definitely 21, and also definitely not 21? Is everyone aware of the existence of the entirely false data and able to ascertain, given a variable such as "21 year old" NOT to make the mistake of treating that at face value, ever?
It's preposterous and dangerous to encourage ANY collection of false data in a pandemic, especially data that relates to a material biological characteristic, especially when we already know that biological characteristic is profoundly affecting outcomes already, and especially when the last ten years of UK administrative history reveal that EVERY organisation that has collected real AND false data 'for inclusivity' has gone on to conflate the two beyond repair.
Including THE NHS which can no longer tell you whether any given patient is ACTUALLY male or female, only that their 'current gender' says that they apparently identify as one or the other.
This exercise ALWAYS FAILS.
Telling yourself that you can and will keep the two types of data separate and never confuse them is futile.
It's like throwing a bucket of poisoned m&ms into a vat of good sweets, giving them a good shake and convincing yourself you'll be able to pick out the bad ones later.
The entire vat becomes unsafe.
You HAVE to preserve, INTACT, the meaning of female/male, girl/boy, and woman/man.
That means NEVER inviting any opportunity to collect data that says "women" that you know you've explicitly encouraged men to submit themselves as such.
It's been rank stupidity that has allowed data collection of 'female' data that knowingly includes males in the last couple of decades. It has irretrievably corrupted every important population level data analysis we have as a country.
But to continue to do this, eyes wide open, in the midst of a once in a century pandemic?
This is insanely dangerous right now.