Wow I had to really direct Grok for my answer as to any factual on the ground presence to verify the ministers demands from these three countries.
Reliable Sources in Gaza Since February 28, 2025, Excluding UN, IFRC, NGOs, Hamas, Fatah, and Anonymous Gazan Residents

Given the constraints (excluding UN-affiliated organizations, IFRC, NGOs, Hamas personnel, Fatah personnel, and anonymous statements by Gazan residents), and focusing on the period since February 28, 2025, the availability of reliable, on-the-ground sources in Gaza is extremely limited. Here’s the analysis:
Absence of Diplomatic Presence: As established, France, Germany, and the UK do not maintain consulates or diplomatic missions inside Gaza. Their diplomats operate from Israel, relying on second-hand information, satellite imagery, Israeli government reports, or limited interactions with international actors outside Gaza. They do not have direct, on-the-ground personnel in Gaza since February 28, 2025, or earlier, due to security restrictions and the lack of diplomatic infrastructure.

Exclusion of Trusted Organizations: With UN-affiliated organizations (e.g., UNRWA, WHO) and the IFRC barred, and NGOs removed from consideration, there are no major international humanitarian or diplomatic entities with reliable, independent personnel physically present in Gaza. These organizations previously provided the bulk of on-the-ground reporting, but their exclusion leaves a significant gap.

Israeli Sources: The Israeli Defense Forces (IDF) and Israeli government could theoretically provide data or assessments, but their reports are often operational and security-focused, not humanitarian, and may not be considered neutral or comprehensive for assessing the urgency of aid needs. Moreover, their access is limited to military operations, not civilian humanitarian monitoring, and they are not a substitute for independent on-the-ground presence.

Independent Journalists or Researchers: While independent journalists or researchers might theoretically operate in Gaza, their presence is rare and highly restricted since February 28, 2025, due to the barring of international organizations and ongoing conflict. Any reports from such individuals would likely be excluded under your constraints if they rely on anonymous Gazan residents or lack verifiable, non-partisan credentials. There is no evidence in the provided data or broader context of independent, non-NGO, non-UN, non-IFRC personnel with reliable, direct access to Gaza since the specified date.

Satellite Imagery and Open-Source Intelligence: Some data could theoretically be gathered via satellite imagery or open-source intelligence (e.g., by think tanks like RUSI or the Lieber Institute), but this is not "on-the-ground" sourcing and relies on remote analysis, not direct observation by trusted personnel in Gaza. This method does not meet the requirement for personnel physically present in Gaza.

U.S. Military or Intelligence: The U.S. might have intelligence assets or liaisons working with Israel, but their presence or reports would not typically involve on-the-ground humanitarian monitoring in Gaza, especially under the current constraints. Any data would be indirect, filtered through Israeli channels, and not independent of the excluded groups or anonymous residents.