Where is it stated that they have 7000 orders to fulfil?
A Tesla representative in Heathrow actually told me they have "over 10,000" and that capacity for this year is already full. As in you order today, you get it next year....
Looking at the 2000 delivered in August it's not too far off.
The "over 7000" number is based on invoice numbers, which are assumed to be UK and Ireland only. Of course some of those will be cancelled, but it gives a rough indication.
TMC Forum UK Tesla Model 3 Orders Shared
The highest invoice number on the above sheet is 15624 for an order on 31st of Aug. Even if 1000 people ended up cancelling their orders that is still over 14000 cars for UK and Ireland.
The other consideration is that the invoice numbers are RHD in which case it includes Australia and NZ.
Also bear in mind that Tesla reserved RHD VIN numbers of roughly 16000+ in the last 3 months. That's not to say they are all manufactured, but it shows the rough intent.
Tesla Model3 RHD VIN ranges