It's a bit more complicated than that.
The clip you shared was shot in the single most expensive neighborhood in all of Iran (Elahie, northern Tehran). Residents of these sort of areas represent the uppermost (1%) percent of the Iranian population in terms of wealth. As it appears, a majority of females among them won't observe Islamic hejab if given a choice. With financial affluence comes cultural westernization, adoption of globalized "lifestyles" and of secularist views. This can be considered a general rule in Iran, although there are of course various exceptions to it.
By contrast I'd invite you to watch the following scenes filmed on Enqelab Avenue in downtown Tehran, a middle class / lower middle class area.
Right away, you may observe the stark difference to the document you shared. I counted every female in this latter footage: about two thirds are wearing hejab.
And if you take a look at actual working class districts as well as the countryside, you'll notice that an estimated 85% or so will be observant of Islamic dress code rules.
Working class, rurals and (lower) middle class represent the great majority of the Iranian population.
Several trustworthy surveys were conducted on the topic in Iran. They are mentioned at minutes 35 and 42, as well as one hour and five minutes into the below presentation:
This is a highly recommended watch for Persian-speakers.
What the quoted data reveals is that a staggering 83% of surveyed Iranian females declared they would keep following Islamic hejab even if the law was amended and they were legally authorized not to do so. 58% consider
shari' hejab (i.e. chador) as a necessity, while 31% will rather opt for
'orfi hejab ("lighter" hejab e.g. colorful headscarf etc). Merely 14% indicated they would not choose any type of garment conforming to religious rulings.
The percentage of those agreeing that some sort of legal action (undefined, could be a mere fine, reminder of the law or more) must be taken vis à vis females who do not respect the hejab dress code stands at 47% (while it reached up to 53% a couple of years ago). A majority of respondents however are of the opinion that police patrols ought not be tasked with enforcing the dress code. 44% by contrast believe that females who fail in their religious duty with regard to the dress code shouldn't be facing any legal consequences. So most of those surveyed continue to be in agreement with the implementation of Islamic modesty laws on clothing, however the differential has shrunk as compared to earlier decades.
Now, exactly at a time when proponents and critics of the Islamic dress code are split into two groups of comparable proportions, the enemy started doubling down on its propaganda operation focused on the hejab debate (featuring militants such as Masih Alinejad and so on). Because the enemy is seeking to foment a clash between these social categories of more or less equivalent size, so as to provoke a maximum degree of instability and social disruption in Iran.
Food for thought.