I'd question that reading.

EDIT: Since i have a bit of free time.

• Opening bank accounts in another country

Access to bank accounts

The law says that consumers legally resident in the European Union (EU) have the right to open a payment account with basic features in any EU Member State. However, a person wishing to open such a bank account should always comply with EU anti-money laundering rules.
A basic bank account includes various services such as cash withdrawals at a bank counter or cash machines and the execution of payment transactions such as direct debits or credit transfers within the EU.

From https://eur-lex.europa.eu/EN/legal-content/summary/opening-switching-bank-accounts-and-information-on-fees.html

Or:

You may want or need to open a bank account in your home country or in another EU country.

If you are legally resident in an EU country you are entitled to open a "basic payment account". Banks cannot refuse your application for a basic payment account just because you don't live in the country where the bank is established.

from https://europa.eu/youreurope/citizens/consumers/financial-products-and-services/bank-accounts-eu/index_en.htm

• rejecting foreign IBANs

The Commission agrees that refusing Single Euro Payments Area (SEPA) cross border direct debits is a breach of the SEPA Regulation[1]. National competent authorities designated under Article 10 of the regulation are primarily responsible for addressing this practice also known as International Bank Account Number (IBAN) discrimination. [...]

From https://www.europarl.europa.eu/doceo/document/E-9-2020-005659-ASW_EN.html

And:

National accounts used for credit transfers and direct debits within each SEPA member country should also be accessible throughout the EU. This is known as reachability. The same rules apply to both national and cross-border operations. Payment systems should be interoperable with each other. The regulation requires credit transfers and direct debit transactions to meet certain conditions, including:

the use of international bank account numbers (IBANs), bank identifier codes (BICs) and a financial messaging standard for all payments in euro;
the right of payers to issue specific instructions, such as the amount and frequency of a direct debit.

From https://eur-lex.europa.eu/EN/legal-content/summary/single-euro-payments-area-regulation.html