The notice of termination said that Twitter has violated Section 6.4 and 6.11
> Section 6.4 Access to Information; Confidentiality.
> Upon reasonable notice, the Company shall (and shall cause each of its Subsidiaries to) afford to the representatives, officers, directors, employees, agents, attorneys, accountants and financial advisors (“Representatives”) of Parent reasonable access (at Parent’s sole cost and expense), in a manner not disruptive in any material respect to the operations of the business of the Company and its Subsidiaries, during normal business hours and upon reasonable written notice throughout the period commencing on the date of this Agreement until the earlier of the Effective Time and the termination of this Agreement pursuant to Article VIII, to the properties, books and records of the Company and its Subsidiaries and, during such period, shall (and shall cause each of its Subsidiaries to) furnish promptly to such Representatives all information concerning the business, properties and personnel of the Company and its Subsidiaries as may reasonably be requested in writing, in each case, for any reasonable business purpose related to the consummation of the transactions contemplated by this Agreement;
> Section 6.11 Financing Cooperation.
> (a) The Company shall and shall cause its Subsidiaries to, and shall use its commercially reasonable best efforts to cause each of its Representatives to, at Parent’s sole expense, provide any reasonable cooperation reasonably requested by Parent in writing in connection with (i) the arrangement of the Bank Debt Financing and any other debt financing expressly contemplated by the Bank Debt Commitment Letter...
This argument is saying that Twitter is not holding up it's end of the Merger Agreement by not providing (sufficient/useful) information and not cooperating with debt financing (by not providing information). They give examples like rate limits on developer APIs etc.
So the kernel of the question is: is Twitter providing information to the satisfaction of Merger Agreement?
I don't know the answer to that, but if is "no", would that be grounds for terminating the deal? That seems a bit extreme to me. To me a reasonable ruling would sound something like "Twitter has X days to provide all the information requested and then Musk has to perform the purchase".