There is no evidence at all yet that they have been forced to stop spending. Big deals don't often happen in January, so we can't read anything into the past fortnight.
In dieser Statistik werden die Transferbilanzen der letzten fünf bzw. zehn Jahre der Vereine der Premier League miteinander verglichen.
www.transfermarkt.co.uk
These are the figures I've found from last 5 seasons (I assume they are at least reasonably accurate).
Chelsea almost £800m net spend !!!
Arsenal and United both over £600m net spend
Spurs over £500m net spend
City over £350m net spend
Liverpool over £250m net spend
They are all averaging over £50m a year over last 5 years. I don't see evidence they are no longer able to spend.