Observation Details
The heading "Schon jetzt sind über 98 % von Deutschland #DABEI" is marked up as follows:
<h2>
"Schon jetzt sind über"
<!-- -->
<span style="white-space:nowrap">
"98 %"
</span>
" von Deutschland #DABEI"
</h2>which results in an accessible name of "[...] sind über98 % von [...]".
Remediation Notes
Ideally, the text content should be wrapped / reflowed by the browser and there should be as little "restriction" as possible.
To enforce a space character –instead of using CSS styles– make use of the non-breaking space HTML entity and mark up the heading as <h2>Schon jetzt sind über 98 % von Deutschland #DABEI</h2>. This helps, keeping the code clean and simple and does not rely on CSS, when HTML can already handle the issue.